Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d6787788d77b21…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd60abad2e7a3e2b6ba23fa93b1a3495 SHA-1: 2f594ddf634b9ff52f82180010fb586e3f22cef8 SHA-256: 75d6787788d77b214835ca6adf61e563f9856561e6c80b59b1b64411d8d9702a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts users to call a phone number, a common tactic in tech-support scams and callback phishing. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the overall structure and heuristics point to a phishing attempt leveraging external links and social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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 https://almentispharma.com/ckfinder/userfiles/files/jinopewux.pdf In PDF document text
    • https://birutelorasin.com/contents/files/kulaporudutafirifaf.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hm8jhrsgtj4m6esefihs5ktgov/xepuzoj.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/4992942574.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/74012669387.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/mokatadakigenotexidi.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/masoxelupawupizep.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/efa99e70e80ea1c34f8c05e3015abc8f/datakilogijukexilutozogo.pdfIn PDF document text
    • https://rjpexport.com/files/fivesikelan.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161417223abd05---89603751358.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/vufinagataki.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f737cf2271---dukupedaxelijaviwisokoruf.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/zekirixobifitojarajabera.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/43841767357.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf7aa60b6---fajipexekaxoxadaxamuxobo.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/komip.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141c269e3a88---vofozejulizarewazubozeza.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/51361470218.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gavosixorimalizulivofexim.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcca66ecff---wizaxupevotenobomunad.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/73090880004.pdfIn PDF document text
    • https://pokereshop.cz/data/file/tofoneb.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/74085508290.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/kixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+san+andreas+online+play+nowPDF 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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 15752 bytes
SHA-256: 851ab458dedf7294bfd6818b9036c3efb41ea8f5e2a5ad030cc81578d7bb7da3
font_01_sfnt_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 10624 bytes
SHA-256: 67225607cff5e62d204ba0a626f7c52ba8b37ce76bc73d21a2f15431616021b9

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