Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa27adcb5014d88f…

MALICIOUS

PDF

71.2 KB Created: 2021-06-13 08:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62a06289771a61d57a14f66e27b5cfd3 SHA-1: c498d8ffa7fabe6df32b30024673bbc8d22d26d0 SHA-256: aa27adcb5014d88fb50627400831378b7c387af300157d21c3683ab26261d120
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9557

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://laborke.ru/uplcv?utm_term=solution+manager+tcode
    • https://china-glass-mosaic.com/userfiles/files/20210605_052634.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9070024a80---tafukexebelumalulex.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57364abc0a---18804649337.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160841adf3edc4---42917995086.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1739d957c---48419170575.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae709cbb7---24601105592.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a186058f265---ziwodevabano.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ce9f3f0e1787f3fe725026b73cfbcddb/vesuno.pdf
    • http://amexeuro.com/an3_Uploads/file/14838281290.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fb65c9ff---1579048335.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3f58236368348a222f0b407c5c0ffb66/7041794728.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/69f2eusdtacu46f86acq1qv90o/mifagome.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16074c1291fb73---garetazosetedaraveku.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b524e892bf---nebemoxulefiwefukupizab.pdf
    • https://rintrans.com/files/butobuzesasanon.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a619871d547---toguruzovoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce89.bin
2cb8b4c2fc951f4d0a000531b31503605952a0388fdc4105e4de2a0447231782		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 5140 bytes
font_01_sfnt_off0000e09e.bin
22dbbfd7fcf05419c7b6092506587f48f48b599b53ad6ad8578692af5791a333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5184 bytes
font_02_sfnt_off0000f21d.bin
bb3f3ce232310c7ff0a3c587ac29007cbe1f155aba523e1d99560d8180d2c81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 9016 bytes

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