Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b55a52bb7974893…

MALICIOUS

PDF

84.2 KB Created: 2021-09-07 08:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52546c21af52237bd58f0e8a4a909e9e SHA-1: 1f1132be0e860bfb2314da2e7a5de3d408abea2b SHA-256: 6b55a52bb7974893a1ec23e29eae46cc551f5639821063a70083fac87f873c8c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous links pointing to compromised WordPress sites suggests an attempt to host and distribute further malicious content, likely for phishing or scam purposes. The heuristic 'SE_CALLBACK_LURE' further supports a scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39fb1e046---wukevevexozazesiromidi.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bp00qde64u6b29pgm14ns398c2/jixapadatoka.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843248e8f08---29353416843.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517fe9ca07---gaposodiwututute.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/66327397270.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ge381m06jhh2v38o28hlafc7hq/manupumigibeno.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd5620e62---pilatemomuretomamelu.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/20272244676.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/kajojafed.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/91624427129.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070413180847.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abceea157f---sabopoludef.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4eea66091---verabaguvovituveke.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/80251763337.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/terododosisep.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/fitizogabifudis.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077037bcea4e---pobigugapetidezadupen.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/rijudikatov.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/davafazotexovomarejene.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f505a8fc39265e720b8df9f5bd7d8938/75271752267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tipitaka+bahasa+indonesia+pdfPDF link annotation
    • 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_off0000dc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 10644 bytes
SHA-256: 03a5a3ad9b569ee26417ec1bc6f9c802f2079ade89f460ed3c32dba7450e1272
font_02_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 20380 bytes
SHA-256: ad5545bb3bac7f94f24a3ca78f5b0beb5d522f66a60eaffcd1fac166b12ad50f

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