Malicious PDF — malware analysis report

Static analysis result for SHA-256 4372107c229e0d6c…

MALICIOUS

PDF

95.7 KB Created: 2021-06-09 11:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49c2f8beac2a3382e51d2207e4877628 SHA-1: aa418b11f494062ccb73a4beefed0fed9d3f1174 SHA-256: 4372107c229e0d6c48ce15c75995847f95f5ed58ee366d881f1cec3493d75c78
156 Risk Score

Malware Insights

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

This PDF document 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 WordPress installations, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The document body, though truncated, contains keywords related to study visas, indicating a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://catamma.ru/uplcv?utm_term=canada+study+visa+for+pakistani+students
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777cdf22278---6317742489.pdf
    • http://fairway.cc/images/blog//file/tasositomugesusexidule.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c224dad5ae---wesow.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9a9dbe13---68556517862.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/20p714591kdhrken4ipggcm3ht/bizewogifanarimifodijas.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b9ea2a30---17232939905.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f139e5f3003d63054f17a678dd49455a/5362764826.pdf
    • https://zlato-eu.cz/upload/files/52556938355.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/51abe2e4450a1b8066db715718e34032/ripovewukiwapegiwusovi.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9612b2a280cde397123153233be0fd88/xetitasug.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c1e23456699ff2cc76531c8632be9f4e/gofuvivitojobumulozug.pdf
    • http://amuseonline.com/absite/userfiles/file/fosikaxoxajajokusano.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a447cc594b---xeduwirukemap.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/52157795752.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d5313bc7---gadenukegokovenoku.pdf
    • http://www.awakohchang.com/image/upload/File/6875911179.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a693e45a5a---62386762362.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001395c.bin
be6ae0424f4d6adf967bef0e767a8cac91b0e3baabb1250dc1515c2e57461205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 5136 bytes
font_01_sfnt_off00014af5.bin
523bc361e881d388e6ca0becee8f6d78f2b3b6fbb7aeadbaa23de5b7f1c6fb47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF5 11268 bytes

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