Malicious PDF — malware analysis report

Static analysis result for SHA-256 e347ded9e51f5ba3…

MALICIOUS

PDF

88.7 KB Created: 2021-07-20 13:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c403e3ade42f2b825eabaec2221fea7 SHA-1: d12fbb416cfe27b63be0df3f1ae7030227143d7f SHA-256: e347ded9e51f5ba335253f69ab476ae0ff42e98502b8bd02747593278d5686d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many external URIs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71151ede34---xapifanilo.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/41e7b360058b43f2169445005b57d47f/98734229678.pdf
    • http://abwninemile.com/uploads/files/97122549711.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cjb66q5eoenqpihs9ff4aj59gs/visubuwizinesorakenanozut.pdf
    • http://currycornersugarland.com/admin/images/file/50833861368.pdf
    • http://energo-winstal.pl/userfiles/file/49977554414.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gbos5hp3te2pdg339unknmf5tl/71659710482.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/5950237342.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/969b9532ff5a73444ecac5eae2d33a74/refozuf.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a453a75f1e4---66712062669.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2a2d430116568dd060256f588e4b1578/suletozekak.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160923733c6d79---6484400155.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/980c36eb248a01e192fdd2d841b68fa8/fawedivadopepenosawinu.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609790de304a1---79817389649.pdf
    • https://totounited.com/contents//files/24417971397.pdf
    • http://paroissedementon.fr/upload/files/diramamozifajudomi.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4483c66f---15648831383.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/c1e28077b196108c8e436b456457ca3d/juputexizerudumigo.pdf
    • http://effektfilm.de/files/file/lepagibilel.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cedb36ef96d4c31e357b9ff9f7e55cf/nojelavidiw.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/sixufi.pdf
    • https://mvpartners.be/images/uploadedimages/file/22459201309.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210617213632.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wodazexilurovinefotokepig.pdf
    • http://for284.org/clients/7/74/7452b259410349f427184d5eaa48bde7/File/2065219788.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=black+forest+trifle+with+kirsch
    • 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_off0000f5f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 16792 bytes
font_01_sfnt_off00010e08.bin
82cc532e3339de5e87e385604551c7cd7040a0cf0d43664812b9acf76dd04174
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 17868 bytes
font_02_sfnt_off00013cfa.bin
126ffba0fa197af89ecce0827f1b92154ce56ac2095d6087a970d2d56de4f91f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFA 10560 bytes