Malicious PDF — malware analysis report

Static analysis result for SHA-256 8319690b7f56cf99…

MALICIOUS

PDF

71.5 KB Created: 2021-06-06 06:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bedaec164f4e687df27c02197420e56 SHA-1: ca2ea4a9561742c72ccd23ae7f6b288278354b5f SHA-256: 8319690b7f56cf996a1d7b167a9a52d8b5905d71f90a62a33483ab8a6ef373b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm or phishing lure. The presence of a 'download button' heuristic further supports the attack pattern of tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=boaz+danken+songs+audio+download
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ad0addc1---48530176111.pdf
    • http://cdmatik.com/uploads/file/90307259975.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b8e7e76d930b692402fcbd70b84470e4/najiwufak.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ifrbel4op1edikb741t7e07gt6/lalewapi.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/7756844896097a8fb8ef77.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087624232694---kababibozulizeluf.pdf
    • http://atdawnwelift.com/userfiles/file/85272011632.pdf
    • http://acpiindia.com/userfiles/file/46719109788.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/2c155f65a96c60c71c7082e79b33260a/sabedijaj.pdf
    • http://aire-limpio.com/img/editor/file/47924496828.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078290f70124---63160601607.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8ca9e5830b1041a784e89e8888c186a3/32017225908.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47bb3204eb---zonozuwewawixejimibufipo.pdf
    • http://aaykpn.com/uploads/editor/files/9958597688.pdf
    • https://oddluzanie.net/userfiles/file/49012849311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89a.bin
b4da7a53e6b1503b95ccbba3bc058c270874c10a979e5d128e2f0412cba70e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 5152 bytes
font_01_sfnt_off0000ea53.bin
59bd24dafd632adb649f938d0551c6effd42e72b7e0cb3fdd28c67b232828f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 11608 bytes

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