Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff174403224e368…

MALICIOUS

PDF

73.8 KB Created: 2021-06-12 13:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9ca793b74cdb67bee7f5b5dc5c81f7b8 SHA-1: ed1e73b06d5cd70280ad0ac2cb79b618ad522c25 SHA-256: 6ff174403224e368d3aeb1fb2dab2ab07a888320bf0f412fedd28ca6fc0fd088
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO manipulation attempt.

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 https://allytemp.ru/uplcv?utm_term=iron+spiderman+photos PDF link annotation
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e624a1990fa57696e20501248b50f7a5/20857541609.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/lozekiwatigejimunige.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606d012691b49---gizimulopuw.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/94234849075.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16094221c91007---32651183638.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6cb64ab5ec080ac595a324b17338224d/bomoruwiranuwagagoriwosa.pdfIn PDF document text
    • http://dalaichau.com/files/ditipukoduzuwopovativa.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60f766aac---22804037072.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/pipokuvofejakep.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e53dd00ff---81028377674.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098393dbf2d2---15972810487.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/27958170276.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/76238033212.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4859cc28b9---28158113104.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6govtgeom5912ftk73013j1p2/gogetidevowibelurobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5104 bytes
SHA-256: 5ea359fb1b17d5ed15a3731410286d334d5f6ccc8beb5f59a2b3cc4681a41eac
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 11000 bytes
SHA-256: f49b0b43bbe33a1f828207398910a5ba1e98c8352f3fc5808133706a3dcd7c14

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