Malicious PDF — malware analysis report

Static analysis result for SHA-256 d760b8ac5de0025b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 14:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbf9692a311336e2fe17ef9f46811966 SHA-1: 99762698bb89cf7301e766a31d912a5b645ae65d SHA-256: d760b8ac5de0025b5bab5f17071f9e85545ee9966fc349b7dc1b8a0f838d5c0f
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate the presence of random and compromised CMS upload links, suggesting an attempt to host and distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic further suggests that the user is prompted to provide a password, likely to decrypt a malicious payload, and the 'SE_CALLBACK_LURE' heuristic points to a potential phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=land+measurement+in+assam+pdf PDF link annotation
    • https://unicorn.mn/js/ckfinder/userfiles/files/bijulufebesebogezejuvig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ad5da6e43---revegubelaxulukor.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/41932170990.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/56290409822.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/4623391058.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/51840132336.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/29802523775.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/65870728071.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cb806f90f32f16ca958f32de55b2cf63/nevejigesisobupufu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207a413021d---30395308977.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/difamukorezuwapeg.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d2603fde8a5d06bb877fcc90d829b038/sobivutunavat.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/23789639279.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fi10bk1p73c8l35oop47n1mm75/32392367204.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744638c29fc---vazugiropuvidararuke.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c256e47608c75c6a31452961776ade69/nidizamo.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/75331231172.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/819b9b36d06dc0942e45fe93a2769068/31919235375.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161000fffd2a22---pubuk.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/wokikujazef.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/35372739762.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/0d880482a2798f24ec1cb325bae984ef/59560345044.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15c8a63f---fajelowitidinuganefujuk.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/pimiguvagugibijavakut.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/13218bb6da2c4e8a3689a9fbf260ab5a/bijapud.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 18060 bytes
SHA-256: 9aae454a3b3d74ee889101410e5b0059d9f58f3a84a30e54a0f70bc82948dcff
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10548 bytes
SHA-256: 86380ffc24acf4d28dec6d4d5dff9d58656d136a3f56506185caaee998eaf599

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