Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b526146532a6070…

MALICIOUS

PDF

81.0 KB Created: 2021-06-14 00:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 816bdc72c0817d24b0ba92c257cbab1b SHA-1: b8e9f6f900b0169c7355e659ddfed510f6277fed SHA-256: 4b526146532a607051b0a0d317e9d23d57b1656bef1d29dbde282527a3494f53
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 installations and utilize form-builder plugins for file uploads, suggesting a phishing or malware distribution scheme. The presence of a 'firmware ddj sx2' string in the document body, combined with the ML classifier and ClamAV detection, strongly indicates malicious intent. No scripts were extracted, but the overall structure points to a lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=firmware+ddj+sx2
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d1d7afe7---31996161769.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/fosiwuwurareliroxoxe.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/980e8475a8e322ba34f9689148fbb908/54124433362.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e0aa1146---84266395956.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d477eba8d6---gitoxabuguxerojufusamu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42abc192b2---simape.pdf
    • http://www.toptehnik.si/images/vebabu.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5646beed0f---27687179180.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8888eb3438---7744156725.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/3c1c8ed611dd3502481f44f1482f824f/59127780028.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31fc48554---15900460551.pdf
    • http://kulturazebrak.cz/userfiles/42022871393.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e659.bin
4b211c1683ba84b4726fcf9e4e6c6e581d9fca8c142bea5c11bfb00bcabe8a26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 5260 bytes
font_01_sfnt_off0000f83f.bin
8db33ce673a93829577edb9507a73832e5a3bcd9b6c680e9db6dc89a4910835f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 11788 bytes
font_02_sfnt_off00011f92.bin
4323bf13ac95b68942b1bc8b193ff03fe427ffaeba7ed9ce15b88f0e54d4eae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16296 bytes

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