Malicious PDF — malware analysis report

Static analysis result for SHA-256 913a91cf333a8099…

MALICIOUS

PDF

73.6 KB Created: 2021-05-22 11:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b69ebaf5952ec14e5b85768b960b2ca SHA-1: 3540b233d1725afa95e9983b79ea85bf4310f6fa SHA-256: 913a91cf333a8099678227ea0568fd6251eba92a043caf408ae84d55410adeab
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, which are likely used to host phishing pages or distribute further malware. The presence of these links suggests an attempt to lure users to malicious sites, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9633

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fc643c46---62235272447.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vs2m69gaav5gv9ne06oppbi7ir/mojusotesagotofiruxivig.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea4863d39---82881070542.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f4389e91---ladajizuvategipabesumozam.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43e5bd4f7---18962849411.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2568002760---feditazepafizuguf.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4d7d68b71a108aefff7c4380a549bccc/89074750796.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16071f03e16851---nubewazepuvan.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6adb9ef3eed4a02c6c77c315f13f6191/65049163437.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead44ca962---95772132059.pdf
    • https://amrapalispot.com/userfiles/file/47881621518.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/e20np7hkkiv81ds7hun7q4ulan/61198727602.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d830072e07---70733370752.pdf
    • https://uleshuzataruhaz.hu/files/file/xozenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cambridge+igcse+physics+workbook+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ce.bin
c765b637e09654c4bcc91a0c54b0162774a8411aa58e7ee99c5681ca1ada221b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 5760 bytes
font_01_sfnt_off0000fd46.bin
f07b3fb9745070d1487cd83a153a0b0d711079ca0795aa21b89ef32d630e6fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11024 bytes

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