Malicious PDF — malware analysis report

Static analysis result for SHA-256 379b51ce95690dd3…

MALICIOUS

PDF

85.1 KB Created: 2021-07-02 05:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b280bfd5e233a70d501a4b51e9002cb SHA-1: da4c1b233b67a4d9b8cf266a7f5b8d85c3df9b06 SHA-256: 379b51ce95690dd3643133830c5e08421e98eb4a6f31b9b92eb412299effb2ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://texmet.pl/userimages/file/55702523694.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0a1f2d4f4fd929355d0e856dc8c85c31/32802952472.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a75544e5---zewerel.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160874bd8626d5---litakaburuzaduvevug.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/a4o64rvpn1crsapkbnj9atd4qg/dasulaz.pdf
    • http://consol.hu/images/uploadedimages/file/84557967966.pdf
    • http://i-daa-wl.de/userfiles/bibag.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba1d1e57e---2991142284.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b2f94ac4dc0c89801810f84e1f781c94/95103571456.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeec8f0324---bemota.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lhdk636p6nidf7mjepdsrhcorn/81492927686.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8f0d7a94aab88db904be7a7678d579e5/76590714224.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4723ce58---43685438685.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/bldeqiil0d6vtc65jj357gc0jb/wulugapoxomojunomikav.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5a8nmj8nvcfa0g41e8kusn1bue/63543782274.pdf
    • http://jrmhandling.nl/upload/file/pibaxumunono.pdf
    • https://hotel-la-licorne.fr/userfiles/file/kexokolibopekubajavoluv.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bef388452d6---11895460968.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=why+dogs+eat+grass
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e89209e05---40385378456.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_off0000ec38.bin
a16a493e04fb2c85b7bd41dcf65fc12e4c2dd7ecc8301bfef620f2e63f167a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10392 bytes
font_01_sfnt_off000103ba.bin
a3b2b3d9e77fe898384a4c41965c697cc0315cc76b2b0f26a0310b23681b8c38
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 16936 bytes
font_02_sfnt_off00012fe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 16792 bytes