Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29b91020f7890d2…

MALICIOUS

PDF

82.7 KB Created: 2021-06-17 13:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 31a3e63701333c5dd3e44c4441813c40 SHA-1: 2d8c74ba8e44f8b8d90e0fe78aa12bb1f97b6cd8 SHA-256: d29b91020f7890d297cb63f6d36bc945aa119a6caa3cd00baef6f1da1406026b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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 http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47dc74101---baweropute.pdf In PDF document text
    • https://amd-export.com/site/upload/file/10611969463.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/dizawug.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c373b718a---9598389125.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/tusuwuzekubodagurasozim.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0a9d5957fbe9a49308971fe496be6069/sikapekabob.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/94429700940.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6c5e2ceff102c61a741f9b998f0a7aee/77601463732.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5aa8918153959cdcf096a2414c178fa9/dekesabemuzadiramaj.pdfIn PDF document text
    • https://bnovum.hu/downloads/rukebowa.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/koveteruzowakaze.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f4ac102e---mibagiloxas.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0547d21d6---26049874248.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3560bc2aa04c717b7ae4bf499dd40d8d/69967799305.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fc8b16aa4ab838b8bd1bafb355c4fbfe/22301229732.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/r3i6jv2aupjed1vk6k61j1o663/19523100653.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/18953931550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dr+babasaheb+ambedkar+pic+hdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 5484 bytes
SHA-256: bc1610a92671663084f2e9625e1977b6f2e8f4a562e328bb66a01302f3a27126
font_01_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 9528 bytes
SHA-256: e32f1a9e815cc372077b0ef640840ffac02de9822a1008d64d6944d60926d9c6