Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3356d393e2fac1…

MALICIOUS

PDF

69.3 KB Created: 2021-06-17 10:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9879d553f5a5e4041d9a4a57d9d8dab4 SHA-1: ab72c92254a683ff566d030c984c9316042a0aee SHA-256: bb3356d393e2fac19053207f38927beecdab170c5cc12db1e209785a8d61ceb0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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 https://nomylo.ru/uplcv?utm_term=supervisor+evaluation+examples PDF link annotation
    • http://arcomproltd.com/userfiles/file/tabalip.pdfIn PDF document text
    • http://laduses.nl/image/file/sixejuxovutu.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/49969610013.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/67128414979.pdfIn PDF document text
    • https://capecoralliving.com/media/file/piwifarujimile.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074092942a66---bilegozukev.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/vumuwikovuzuj.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/wiledasodajipizazuguge.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c053d4014fe---79358403629.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/71571164035.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5b3047b966e8691c53148180aace1be2/zilunenemuvuvuv.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef391c0760---98650714050.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/44132451399.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e5b2b9d0---40620632275.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/75360052408.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2dd17fbf175da60ccfed7ad23c2d619d/78195436165.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60f366975---3688996714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 5076 bytes
SHA-256: fd62d3611a0293ba100f22d595e06a3374247b5a4bc4a6dfcbf77b09ada33fd7

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