Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a72219a71e9f9d…

MALICIOUS

PDF

99.0 KB Created: 2021-07-22 21:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 346dc1faf70a8dd0ada19681aec251be SHA-1: 281878722720ad22d7a3e000744694a0a611ff5e SHA-256: 34a72219a71e9f9d961e03f9e494d6c56f178ae1d0d9f9177e27cdce2b2c4202
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit user trust, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094421d6a643---vagup.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb4cd1032---musafanetabanonezixa.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a918c9e5---83576377605.pdf
    • http://lapenya.cat/imgjovesnaves/file/43092418571.pdf
    • https://imagebeaute.fr/userfiles/file/27135573358.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ff3903ad770850be04546f2d62ae1c0a/60067511494.pdf
    • http://www.frank-diagn.hu/userfiles/files/1762715528.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/def8b852c430b69a4b3005c96300e4a5/80817588917.pdf
    • https://palezieux.com/ckfinder/userfiles/files/sosivegij.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/83100538908.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kaa0qt3ktk755t4521o4k7qf30/saviteludolezer.pdf
    • http://nwatchonline.net/userfiles/file/gavorugugibobewuga.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/supolew.pdf
    • https://f27szerviz.hu/upload/files/wifolitetefuw.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/91464994249.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b59f88758---58913096323.pdf
    • https://ntiverification.com/userfiles/file/38693675955.pdf
    • https://renebeumer.nl/userfiles/file/wilenojeripifesanulojixuj.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573c59abf0---doxizuner.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d2b86861134e8e8f29828ee5c1e61d3c/faxiwodofepujefubovelubu.pdf
    • https://flyingfish-stay.com/userfiles/file/15004288581.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f946943b581---xoziwoli.pdf
    • http://border-inn.com/CKEdit/upload/files/wizurufuligopuniveluv.pdf
    • https://toptenstudy.com/upload/files/BodyFile__60ECABE3EEEAE.pdf
    • http://phantasos.org/userfiles/file/kurewifeliraberojufusavu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=final+year+college+quotes
    • 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_off00011e0d.bin
9a0aadf3a73266e35ca45b7c5a4b4d855dceafbae214299a63fc203e57d62e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 17860 bytes
font_01_sfnt_off00014c5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5F 16792 bytes
font_02_sfnt_off00016476.bin
89a81d9fdfc665de348fbec0cc4e16a88b6d35375b32e57be082ad1349c1715b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16476 10740 bytes