Malicious PDF — malware analysis report

Static analysis result for SHA-256 92eca39c682ace24…

MALICIOUS

PDF

82.5 KB Created: 2021-06-25 13:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20e73406fe44ce826fa2e441009bf120 SHA-1: 19c7b19751a41931292b42b6d293bd24162ce9e5 SHA-256: 92eca39c682ace247a395093e1b0e86ad90302bde382ee9eb25e41256eeb6bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=the+last+supper+verse+in+the+bible
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad098583609---7491690071.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b748fe4200e---87920373903.pdf
    • https://cornwallstaffagency.com/userfiles/file/25429441090.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/61313903819.pdf
    • http://topenglish.sk/app/webroot/gallery/files/nijoveve.pdf
    • https://aterhesseg.com/up_image/file/wodepalutujupubapakagiga.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3715ed04418eacbf967ed88f041c5c9e/12689536013.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ad2325b54---19809096143.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd3ed4527---48324367140.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/b51e0772c347ec690eda322e150ce522/93052098925.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/00753328cc34769f215223155a21bbd4/12099396450.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/1841c9aa855482f856861413df69d3df/101137094.pdf
    • http://hakanemlak.net/yukleme_klasoru/userfiles/file/bonosisotezuxojazu.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddf57592---sesagavobajiraxatisamegos.pdf
    • 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://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_off0000e1e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
font_01_sfnt_off0000fa00.bin
bfe1d1ade1be83f55a08dc57750fe71035ccafe3700e0998e03210773fb5d7c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 10500 bytes
font_02_sfnt_off0001119d.bin
1d26075153735a2a3ff0b203a34e47656c04c64580d4da8665a527078069b422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16776 bytes

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