Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4cfac886d3cfb1…

MALICIOUS

PDF

79.6 KB Created: 2021-06-20 22:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2cc433d842bb18bd0c9174269a3f4a7 SHA-1: bf281f4149631d50e82d291c7b4eb00fff6084b5 SHA-256: 9d4cfac886d3cfb1deb56741a182734796e19a580e7705c03090d0ed24c57d3f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to lure users with promises of free software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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://cructi.ru/uplcv?utm_term=minecraft+java+edition+1.14+4+free+download
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f790d49b97---25315148124.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5403e7eeec8a719344dd9579f293d5b5/raxoj.pdf
    • https://avigailpekelman.com/sites/default/files/file/18097953786.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p57f54m9hnjritajlg07ab9dti/47194023711.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/92738d63cd9ff986f3a718bbb65a9bdc/wesozumevizajobenadulodo.pdf
    • http://czdashan.cn/uploadfile/file/2021051503023873499.pdf
    • https://foodphotoshop.com/userfiles/files/vugana.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/70520579575.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c503bc62196---38358541311.pdf
    • http://bjallstar.com/upload/file/zepukimutipageforurame.pdf
    • http://stalmost.pl/userfiles/file/65368833174.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4a07c278b1b7a35b91b80b4bb50ab41/leveguxebogutapow.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f0de9b1ce03cd82a1521c6e79bbe1ac3/fopabimutalegudesoluviwu.pdf
    • http://computerdoki.hu/user/file/dadumexagasow.pdf
    • http://momsystem.ru/public/file/77924250922.pdf
    • http://boxethai38.comupload/file/faxawuvixonesefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e828.bin
5e4c9ac1294856735460e27c25e10cc554b08f0d901964a59c3f29c90019c5a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 5032 bytes
font_01_sfnt_off0000f96e.bin
b0028aab7cc3d28fe887cb255ce64ae22a677942004ed0c2c697f98e53fad3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 12656 bytes
font_02_sfnt_off000122ef.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122EF 4324 bytes

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