Malicious PDF — malware analysis report

Static analysis result for SHA-256 895da17c9f424d67…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 11:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bdee28702718c1d59f8421c4786d154b SHA-1: 0f32d3bf49c79221e22cbdc467a70ff18d06d287 SHA-256: 895da17c9f424d6741d386a9d2bc3f6f07c8a395b35229f80edbfe53bef0b1c8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/bb28fngadffkvdqmi35gb2ke50/59086342714.pdf In PDF document text
    • https://coil.hk/upload/files/50867496134.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d51e2e8d---xozafedina.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/56511397530.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/15802613779.pdfIn PDF document text
    • http://ubest.ru/images/file/80255630254.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/rokukowexad.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/berefusejabute.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/tirab.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/bozilavatilazuvinurod.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/bazuwaxewibuxexedefuku.pdfIn PDF document text
    • https://armenia4d.com/contents//files/19100340321.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/10318416141.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64362d81f7---bagaridakusulutugepoled.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/8148801987.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/4f2f9291b10f8f9d8f96a77cc43d5e09/galatazabu.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/vusopugixizivugokaponod.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085db0e05c8e---57041079655.pdfIn PDF document text
    • http://budropol.de/Upload/file/60559380579.pdfIn PDF document text
    • http://dzbnf.com/upload/file///rozobukewolomate.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/01213a334f6b4df56b648ffe9d0467b9/76121106832.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/kaxelasenutofeforal.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/juxepefaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=estufa+eskabe+tiro+balanceado+2000+kcal+manualPDF 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_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 18076 bytes
SHA-256: 573f24dcf6bc71b2574c4dcc6959176ca7daaae52c9018d3c023f11d50f9cc34
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 11192 bytes
SHA-256: 860d45e7488268f09fb6b6d06a0f6533e70f2872383043dc336e78f5d7bb20dc

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