Malicious PDF — malware analysis report

Static analysis result for SHA-256 691654ea271c7253…

MALICIOUS

PDF

87.6 KB Created: 2021-09-06 20:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96fe269f1e6c58299ee104f339fd2c6c SHA-1: 8039d6d3622a0f12a13ff6b2b2b30a8e148cdb99 SHA-256: 691654ea271c7253708c6f707fc988eae5c9bb9d0e1e53058de6f3a82993c3a6
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous embedded URLs, including those hosted on compromised WordPress sites and disposable domains, suggest a link farm designed to redirect users to malicious content. The PDF's structure and the presence of many external links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=mecanismo+de+a%C3%A7%C3%A3o+opioides+pdf
    • http://dagmare.de/userfiles/file/mozov.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/57014461143.pdf
    • http://amuseonline.com/absite/userfiles/file/vabote.pdf
    • http://files.ibiza-ferien.de/file/jijidexofir.pdf
    • https://theshamrockpublecco.it/file/71239374798.pdf
    • http://strahovka66.ru/userfiles/file/pepobukegezipo.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a2669c15574---37207296695.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e925a291791---sogubagabelarepejire.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d70d68c69cc18ef1379e3bf26d8a456/petorusuki.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3cbf65cf4d---wozuxofi.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160742a2e28cb6---59709524027.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/34b89ba3063e9b94ee7c299eb95a8687/99459072117.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/rufefebofekepam.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ea9e5e8e0---23922141372.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69d81526a---xesizupisutap.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ba102a38---tukibo.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96ba4f824---powoboxasezonujuvapowaruw.pdf
    • https://perfecthospitals.org/FCKeditor/file/sisekesazugirad.pdf
    • https://marljivo.hr/userfiles/file/35832480442.pdf
    • https://bd-sokolovska.eu/userfiles/file/5552822536.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ddblihc0ted3o20fhmr92nqifo/43905587014.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1171fe769e5029606e0848c17aaf0a2b/sisiru.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_off0000eaca.bin
a01815a8dfe2b9c7cbcadae212a4fe034b2ec2ec61263fd8a18e338e24d260a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10996 bytes
font_01_sfnt_off00010389.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
font_02_sfnt_off00011b9b.bin
09787b331281cd9b512978341bccede0575cf68c16a571f5f98ef030d3d80862
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 20480 bytes