Malicious PDF — malware analysis report

Static analysis result for SHA-256 26073aa1c4608148…

MALICIOUS

PDF

65.4 KB Created: 2021-05-10 04:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cf90fe5d20093c215e8e226f48c225 SHA-1: 9a128e4a309ea6801747706c431fea7b992346b0 SHA-256: 26073aa1c4608148846befe88a9f664093f2c2bbb1d10cb8563fd8f5628c8e56
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically related to phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure for game-related downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

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://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d0a4a692f994bac2af826f196b5407d1/96772484944.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe79ffaf---pekuki.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c24b14bcf---vovemaxed.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/3787a240d80ff48ace1ee6b944a664fd/bovoganiveliziwefonuzapus.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/7jqc6f82r5n0t0c5lefcgd2mm0/1821718796.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8d34913c---54302849860.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4b917db413f8d5837a733417a03cc6ee/12382453293.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/raic2vqeqjuo4fg6p5lvbvkj15/26395453835.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086ced01aa16---11401790221.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5ef7cedd---xetajelurexikaxud.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf387a2ff---vavokunonobisaxo.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a533708f79---97710513026.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28f3629b2---2423862806.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0c73836913af7c43327c58091e585358/vukogolibal.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/9432193a7ead72c790ae3fac8ff74766/49829972582.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e7d1a855---31591514192.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=assassin%2527+s+creed+3+apk+game
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03c.bin
8a7d973b1e7cefc6aec93c38aade0266c7774148e077ef9ac3ef27fd3f1b4fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 5612 bytes

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