Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04801c341adf065…

MALICIOUS

PDF

93.1 KB Created: 2021-08-08 21:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c3f9d957839f9599175739a6c46d6720 SHA-1: 3b87d778af54855863e1e3bbe4ace6b42a533ef6 SHA-256: a04801c341adf0651c2a0cedf78a47b196342be6befccb9d64a7ebdfe9f7ab01
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It employs social engineering lures, specifically prompting the user to install a browser extension or update, and also includes callback phishing elements by asking the user to call a phone number. The document contains numerous links to potentially compromised websites, suggesting it acts as a dropper or redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://broadviewlibrary.org/uploaded_bvlib/file/sawajomivik.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/26216815487.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/pirafojufiwanowazemigiw.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/97647314035.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/lebusuxunur.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be323fba49a---56697098984.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ad6935154---risox.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e465c852b---gaboterasonisimageneri.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34016484516.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/aa10c445292cd641d94569d658bdee35/kezata.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/74665a24c1a32a2c9e24ec67e6759864/60071099599.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/pitesejedesa.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/41872812453.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b4ccb6de2a9ff2504c43ce26220a36ad/lufujo.pdfIn PDF document text
    • https://sca-kc.org/scauserfiles/files/39939878843.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c139f126df6a1e522825bc80a5bee59/rowujefazizizozanuxekipuf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9355d66544a86bc40879af004cf5dc20/tewaxexugiditutenix.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/53b0a650e8ccde3b6549554b9d751b36/40189690732.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ad56d703---84984795655.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4332c0c80e4e812a7aaee129752ee850/64188534716.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/29542394343.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1nc8f1p7nr4je8mb781svbkmg9/49670706166.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sixejajuxinenafiteroganik.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/refededonumonibegat.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161065ee076ceb---danepivefopavada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hobby+lobby+promo+code+2020PDF 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_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 17696 bytes
SHA-256: ae50b6315273d95b1278caef1418bb94663217eddfbb8b070ca1209c995cd3a0
font_01_sfnt_off00013588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9F 10536 bytes
SHA-256: 22900a6fc84ba130f042cc3f01ff9f05f8dee027820e3cb846d95f9b72ece871

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