Malicious PDF — malware analysis report

Static analysis result for SHA-256 338bc7eb7601aebc…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 16:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc2df0f83c34787787ee26c11b3650d4 SHA-1: 8e8b5cfbcd681aaea42c3fd011f5b48359ecb663 SHA-256: 338bc7eb7601aebcd57743e947d0be3c22748b83738cde55533ff9cf34dc820d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs hosted on potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4cc64d95---xakejolisikegagat.pdf
    • https://magerp.org/upload/files/94473521025.pdf
    • http://agendatourvietnam.com/hinhanh/file/23077558993.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/i3hlldagt6138m2pq71j94iloc/91480243239.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b462f3cc6963b50de6791de8042d81e3/memibulivomivul.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/aee3da65535c58ee30030ccf59d6065f/gozow.pdf
    • http://brandiassociati.it/userfiles/file/rafululezorafetu.pdf
    • https://pmeds.us/userfiles/file/49287855521.pdf
    • http://temple.mo/userfiles/file/40714954180.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/34796460ddb85b695b5c7e81746285a4/jedamulekutagimajofuve.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29bbe997d9---76128349183.pdf
    • https://allcreaturesinc.com/files/files/86756736681.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/i9ts7eber8h8s1e0mi0fo7rpeh/waxusa.pdf
    • http://brooklynsmokeshops.com/admin/images/file/pejokukipovibamev.pdf
    • http://hvpeds.com/upload/contents/file/dujafenokenota.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a613c1d397c0850bc68aab926f0f91eb/vodabozepisamazew.pdf
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/jagokarobezenawevejulox.pdf
    • http://khaskhaan.mn/uploads/userfiles/files/zazesekij.pdf
    • http://zonwering-belgie.com/ckfinder/userfiles/files/44326578397.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/16fe71d5f72577aa7f67182720773d20/petabu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672c125bb1---kumawemitexokop.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160963830dcb18---742619198.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/86385150625.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75191f48b622c218dddcb259370414aa/paruva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+orc+of+vengeance+silver+key
    • 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_off0000ede1.bin
ef024d142627ccae6a07801cf8b2a1cde461d6416a70b66ed0d001dc090d7167
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 10752 bytes
font_01_sfnt_off0001069b.bin
ada618fe01517811d328bde3cc07e31940dbfbbc2cfa255f503ad8c5e5780011
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16828 bytes
font_02_sfnt_off00013255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13255 16792 bytes