Malicious PDF — malware analysis report

Static analysis result for SHA-256 400e66d7bc6947aa…

MALICIOUS

PDF

76.1 KB Created: 2021-08-02 20:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f10cc0c4bbaeab4aac7902f2beeac2e SHA-1: fde5333025b4a3cd592dae2eb1474b35d6567080 SHA-256: 400e66d7bc6947aac5b770d0c3f49b5641a0a7d3e74df8440fa4197106cf0264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/236d2e33d6d80775a7496500f417a1b4/pexajotulebumafijupe.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d7c49a1dd6293920674797d756759a26/16566605109.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f299946b4f3c712d6bee720da0408eb4/30801312156.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv68403hadnffga6h7lmmndqv7/reruxifoken.pdf
    • http://robalton.es/Albums/images/file///ropiwenexagazi.pdf
    • http://www.findvoters.com/userfiles/file/1737858968.pdf
    • http://www.hangmandigital.com/files/file/ronujokus.pdf
    • http://esistore.de/userfiles/file/pidazaw.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160745a24db45c---rowuzidonixagepa.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c462ac75463---19291544019.pdf
    • https://al-farh-iq.com/upload/userfiles/file/gafoso.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f0683e1a---bedotalixojotaw.pdf
    • http://kaupa.cz/userfiles/file/jevar.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780e8e8f25c---nunolagosajurukozexurete.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fb178985---gubivo.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160909f2d056ca---tepanojisododu.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/c740603c5e0ba641e5bbeb310b20cf94/welularotuwiwovedewofizav.pdf
    • http://yhbinternational.com/userfiles/file/pibarewapebegedakogik.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160723085466e3---17165124947.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jl38li6c9t5mggg2v7qnfc5v4e/xawemew.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/jurekiwam.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/58pbjakg3tjn8tt359kh1f90gv/zogebana.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15fecee75---pufudavuvoxekulu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=barbie+and+the+12+dancing+princesses+full+movie+youtube
    • 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_off0000c35d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC35D 16792 bytes
font_01_sfnt_off0000db6f.bin
7b0f29aed36ef74aa1783fa7b14484d11e6bc8eeadaca7522576283b3608f553
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 16428 bytes
font_02_sfnt_off000105f3.bin
c0c26c1d1e151a2527abc949496d3d40a4a8c291fef2ec64f30b49a85b59bcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 11712 bytes