Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a1375e02824ad3…

MALICIOUS

PDF

73.7 KB Created: 2021-07-03 08:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c3364fe48be34a88dc6ef73e33de6dc7 SHA-1: e3ec8b14fc8eae8798bbb433adf6990490d88758 SHA-256: 06a1375e02824ad394c46b703b950d255cd339c1b0de61299eb4e9cb4398c78a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or credential harvesting campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 http://amandamaitland.com/images/file/91646173125.pdf In PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cf02a84b---12193004218.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b0f601da---difenibi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec11298e7---47261246011.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/56351327616.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/palepawagararafekepozitax.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a62268636---buseb.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080627ded413---39254712983.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6ae99d8c72d31a1af981c534d08020ae/lesefazidefixe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ccf7c305f60190bab5bed3b169d449fc/rozegakafakirofejigon.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7988bf522acd937a313fedda634d008e/kijexuferatadifi.pdfIn PDF document text
    • https://kermanrooz.com/img/files/87258057755.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/4cc422ce35b5e27742826643313ef728/josewivufu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/8072128695.pdfIn PDF document text
    • https://stopserv.ru/files/file/rilotuboxeweruvasewaten.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4f8140a3db3358ad7a4737a8f450deed/muleruweminuz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/wilixupazezufenewiriwug.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/35230307026.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1955fpu6nhlq1lbjdjl5u9hlj4/52232615458.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/99641595279.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/7448659919.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac021643025---70235468096.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rvnku8rgdqjo3at31c6ghohrh6/wabezedub.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/a4phpn1po8usg2fuiia0eeit37/43180158622.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abde30d43df---jilanate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+case+of+the+counterfeit+crankPDF link annotation
    • 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_off0000bf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF69 10544 bytes
SHA-256: 1989fb234506cae3944766645197a88c84ce38b42b51b62d33bf3c6c6d597094
font_01_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16652 bytes
SHA-256: 1513bc315f874e109f6839d9fadfc32a05d4d27af95a1f28bd99da16cddc914b
font_02_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1