Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e304d21c52952f…

MALICIOUS

PDF

86.8 KB Created: 2021-06-30 20:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63d4cb309e274269108500c635f8f8ec SHA-1: 3d245c0d2d5c4ef8f59ddcca0b3ef8223666dba2 SHA-256: f6e304d21c52952f0b48bda21117d9536ddbf6ea752f46e158783abcd9035fe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oniceh.ru/uplcv?utm_term=games+for+passive+voice
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b7e79d8a---xexazakuriril.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d01be444c---80571877812.pdf
    • http://brixtontaxi.com/survey/userfiles/files/22289702924.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce3579500f---zuruxelufavamezikanufo.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/vejovukedarileros.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/rujinoxi.pdf
    • https://foundryindia.org/userfiles/file/46702416217.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/32c50e7df00c95a798d7d8d29c5b2f5f/87594486596.pdf
    • http://matstravel.ru/userfiles/file/67728130986.pdf
    • http://houselandia.ru/files/jipix.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1789e0748293f4415bcdce3afaaa2611/ruketimenipat.pdf
    • http://sungsam.net/userData/board/file/48301285655.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088fcb8b6836---xuresofegogigelo.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/mg9j0v2thj1apiqb5jrleuac1j/95287629770.pdf
    • http://etkindenetim.com/resimler/files/15696478304.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16779835a---neguratasisikanovose.pdf
    • http://dolcezzecaffe.it/file/86289262705.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc72b57e22d---46748864118.pdf
    • http://angarakshaksecurity.com/userfiles/file/nonunegemolokegurusaduv.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c993611de48---fezedaguvagebilalogeber.pdf
    • http://whatdwellswithin.com/file/vuselixofimar.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcfc179fd---10507260567.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_off0000eece.bin
0df9f88ad8065ca8e6aba328418eb8cecacd19e80d070493419481c6c0159d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 18008 bytes
font_01_sfnt_off00011e0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 16792 bytes
font_02_sfnt_off00013624.bin
3a107fe98518bf9a5b00d44dc17c39fc7e6324c0a6b5dd37b58ff54802d39a62
pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 10500 bytes