Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626c791abc27466…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 05:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 94da7299c073c1c2dee9af80cf4a008c SHA-1: c26a24d1b2d54fe4b67f1034bb8d98b93dabd1a6 SHA-256: a626c791abc27466cc98c55fab10a4c09c812199c0167d88cbdf1f44b1541706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and URL patterns are consistent with techniques used to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=list+of+hormones+and+functions+pdf PDF link annotation
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69222cc0---32047101588.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/12948420685.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/88702784929.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/12933630523.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/35857959837.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nutukesaw.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/96770047413.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210813221639.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/99050791099.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/61892564014.pdfIn PDF document text
    • http://dsfly.com/uploads/files/4819713647.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9080f0cdb---pejanagedapobezubus.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b511ed76a---46507327989.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/20143901638.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rpni1928mjddnme7195b23l7ro/fesigepo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/46d81b9c4ba36aae49abde22e871439d/47847218450.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0fc08572c---xemubemila.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/fibib.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/33016932119.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c31d6b5c1---vuzumokekenax.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/66299825902.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607205fa8839c---fobefixedejutukipi.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210730_061513.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ad35ff34d602aef7ace4281f24d9fb08/jexigenivek.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 17552 bytes
SHA-256: 412a83e613404bf4381ddac3c2d9f62c57c58d98e477701cdbd950455404af59
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10896 bytes
SHA-256: 3c024b547a8a7d28fcc04b125d1ed6f18ef62a7101365354f68335d0e5a6d96c
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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