Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f5a0ca7db4bd5…

MALICIOUS

PDF

104.0 KB Created: 2021-08-10 23:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef2e1bfee3bea3bfb74fcd6922911562 SHA-1: 4e19da146b7bf606ef15094d750aec9c82b7360b SHA-256: b38f5a0ca7db4bd511821a73869e0ff4c15e5a8391520a02faaa3656ce288055
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or appearing to be part of link farms, suggesting a phishing or malware distribution scheme. The PDF structure itself is also noted as potentially compromised, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://abwplazaview.com/uploads/files/99801743495.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3fc390cd16ddd0d9030d84c3f0bef251/redamirafegupup.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f4eebbd8---datowigodesefon.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/afd6e9269678ce14df297fbd8b7c6744/68584619652.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2cdc5d441d9d591ec1bb1f46ee8ef292/pezavowatanoxa.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3282bb297---joxusaz.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/fuwanorusimosemo.pdf
    • https://chezgregoire.fr/userfiles/totaniwasebiragemomabenem.pdf
    • http://technoculture.cz/admin/upload/file/53743838911.pdf
    • http://ktcz.eu/files/files/80877890493.pdf
    • http://acquadiqualita.it/ckfinder/userfiles/files/56434095160.pdf
    • http://wib24-admin.de/uploads/file/xegebina.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/026fdba3cf628fb1d5b14f2f135bb0bc/2477765828.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9be3e9f78bad91ba51ab063f33d1761f/96172192216.pdf
    • http://huh.hu/UserFiles/File/95963541036.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc509a1ee23---pafepinisebaronokasi.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/79u2q4aok7dbdjcqkvfvubsgu0/zexedawasibip.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gi92vtftlbs25e200fgmr7sjrk/12117154046.pdf
    • http://mynigaoe.com/upload/file/20210509055956.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734b920bcca---maxijusonarezevej.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1ed40ef7042e12f5ee19c68eb14e1563/xufetezotup.pdf
    • http://tomaszfilipczak.pl/userfiles/file/20579977483.pdf
    • http://mav-auto.ru/images/file/fuxewagasenexojid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=que+significa+ego+en+un+hombre
    • 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_off00012878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16792 bytes
font_01_sfnt_off0001408a.bin
115abdeb098d14c7ee055315f59d15a18b0cf22ac8604c7043a6a437b6b0ba72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 21376 bytes
font_02_sfnt_off00017728.bin
c4cfb4636b08359ba37c0f86d89c6bb3c1519c3361cd8fda746917d5fd0efff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17728 10936 bytes