Malicious PDF — malware analysis report

Static analysis result for SHA-256 7765e9062cb3bfc0…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23e62a67d6215994ae8cd9f626314e76 SHA-1: b38a93576b5b72054f44e4b4f3bc5891bc1ebf49 SHA-256: 7765e9062cb3bfc0d72e853c09250247f1151e41e2a293efbec9fe38e9284ce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ji4546j5deg3m0feimrtatj6a7/jemiwamivujasezezaw.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/1db03248bb20ca79e8f7fbba554b5a60/939535963.pdf
    • http://debeleven.net/UserFiles/File/vokugulusigegitibara.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/95bdm0ct51nt1igdbva2el1fbp/24497822980.pdf
    • http://alemotta.com/resources/original/file/denebatawij.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ddfdaf39---sifomaderim.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2bef993c6---15370165602.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ab3091260---10394023995.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/75328864824.pdf
    • http://bakoca.hu/files/file/tesinofikewetute.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/be0550820dc5c66f2997a0313c396097/19382813069.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160734f6690e4f---56945101153.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/fbdabb8a8251218798c5dc46314a7b6f/tadunumenivikijojiwamixi.pdf
    • http://essuances.com/ckfinder/userfiles/files/teduwavojoberut.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb37aae3ed---9438472334.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec2a88e1d---xivogabojesepigafixuxa.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8eaa26ca71349b339b1f33ba49c53689/23258097522.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/985b9cf42be01056bdcd740af3f2023e/topawamufezunodudemiteto.pdf
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/94177457207.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83e81e73c9---36778344166.pdf
    • http://yongqingtech.com/d/files/2232459902.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c42d66573b7a09cb3233d70f4b5f4f09/79998070322.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087db3aee70b---dezesugalipove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=solvation+energy+and+solubility+of+ionic+solids
    • https://lapdonline.org/file/45829946075.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_off0000f49f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
font_01_sfnt_off00010cb1.bin
ad0ea5b9fc76b250695aa6ff66a8d0ac933c0658bf60f9398c8c63c053dda0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB1 17404 bytes
font_02_sfnt_off00013a61.bin
18b547e51c6861a9c587302226d0b7308aa0e85e0c7d24229ce94f2be0fa557b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A61 11148 bytes