Malicious PDF — malware analysis report

Static analysis result for SHA-256 c501c5cfd99bb322…

MALICIOUS

PDF

84.5 KB Created: 2021-07-05 13:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c086ba268e0ba7131185a2cc1fc41a1 SHA-1: 8b7b55bcaa07bef62341d17f28d44302edcf044c SHA-256: c501c5cfd99bb3228f1d8c332e8bb5ca2ecbd89166f9b546481688f776629b5c
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites, many of which host further PDF files. These links are likely intended to lead users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/3750096cb680a2376b9a37d8300dc401/zijepot.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d2c90a99---68789862214.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c981bc82ddc0181ccb37f390c4aafbc/13941217472.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c73bc55da918ad95a113aec2580f4ebd/tuvazivifuxuguxexuke.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cejh6t0gbo9a556vk00pk0lsng/foburerem.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb03705f58---19790026493.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nvdisvlr2rg58dj8ndedal2476/ligexajimimado.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a3e6ddbf---31397999912.pdf
    • http://liffeyartefacts.com/fckimagefile/file/76408309793.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/libuteja.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a55c11f028f9f4dc5348b1e8391ff067/dodetax.pdf
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/2661112261.pdf
    • https://xo-sound.ru/userfiles/file/96824499377.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2ophg1m4nvpfn432r3vs4lec34/wozinowalotonutifo.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607306823464d---95066998389.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5d70cdaddeb48b2d1315c12cf8c2c2db/49669338677.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06fed01794---45526134534.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6l8ujbq75o79igjbu5uv0qpdu4/95535072921.pdf
    • http://bluenanum.com/ckupload/files/79463414237.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/719deq3j9l4qlfrmpae6csd5jl/xiwelaveb.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75197213372.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d32c165c986---sikofiravi.pdf
    • http://macautemple.com/userfiles/file/xovof.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f8fckr14asn0frijsp98qpn0ei/95561372217.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+get+dragon+eggs+in+minecraft
    • 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_off0000e558.bin
e5ee91c80222b8f965294e74e169e98763926c58b54169c5c1da69a59dde93b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 17392 bytes
font_01_sfnt_off000112f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 16792 bytes
font_02_sfnt_off00012b0a.bin
45b56ffd9864e0c971bc78379889c12bf1fcfc66210391639673b2edd6ed15b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 11064 bytes