Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca9bca93714c607…

MALICIOUS

PDF

91.5 KB Created: 2021-06-27 19:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4337c72e2ea4222158551ba4830e668 SHA-1: b107d0ac304e4c5fcf2aabc5f5ca8d36e1ba5168 SHA-256: 6ca9bca93714c60780499ccccfd8bde1b79a817488b914d76310fdb14f7aa0a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://huntic.ru/uplcv?utm_term=types+of+moonshine
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ne8gbbq5u02j2qgc5dfpaq6rs2/54936084624.pdf
    • https://fishboat.hr/files/31275884436.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/82287599965.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/df8dbc64bb6d8283005118b3a3da6ef7/10891721355.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d2e5bb45---gobetojiwufosa.pdf
    • https://preprodpcb.com/userfiles/files/15675163784.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b15c74994f---metirozurepimulozizare.pdf
    • http://alpha-cp.com/userfiles/file/ganav.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/b26mtqb4husbggs24bso0r7gdu/mavif.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ac23aec0de565a3df05820d9904a988a/tevasogevisewirizevor.pdf
    • http://www.cafeinca.com/img/public/contenido/file/pogodobaxamimerikusifetem.pdf
    • http://aire-limpio.com/img/editor/file/63330668345.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/el7k5tpk7k7ontg38dsqhba6p4/zutofexopufekuri.pdf
    • https://nadamasristorante.it/file/81631436467.pdf
    • http://aceonlinementors.com/userfiles/file/79617255603.pdf
    • http://sosnovgeo.ru/userfiles/file/nasogotaro.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/df97c4317485ade3e10a7288e8a740ad/vexipiresimuk.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b2228cf3e9b226bd9af10c49ca41cab8/46514252040.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b19f80be8e8---zopanunemutagadezefab.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87cd12ea8---lewusejabizivef.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607392d108889---85502827025.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910216baa62---3443222995.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d586a0b7ee74fcb837c25dcc6cf7bb7f/83183088040.pdf
    • http://beamstraffic.ae/amb/userfiles/file/10075967239.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3a24a1b689dce89069852faba7e462fa/gojixafipubasopememotoz.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_off0001016f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16792 bytes
font_01_sfnt_off00011986.bin
47bee5e7745661f175f1669a520d04e3da468bd12310e730d4f9be1175f126e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 10292 bytes
font_02_sfnt_off00013081.bin
f9fd9e447808b172f75156869054f6a9d10345dd945c0eeab4870c43ebdaccaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 18628 bytes