Malicious PDF — malware analysis report

Static analysis result for SHA-256 019cbfefddbe8c13…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 11:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d7507e60aae10ae8c3adb875b3098c6 SHA-1: a987c8b82598ef58c44d2b737d47fa1c9f01baba SHA-256: 019cbfefddbe8c13e81ed3df930ea16caefe3634799add3e77b5584842781cae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links to external sites, many of which appear to be compromised WordPress installations hosting PDF files, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c55c627ecae---zatopamelonitewa.pdf In PDF document text
    • http://turksebruiloften.nl/userfiles/file/jubaregajer.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f965f03124c3f9462131ba25612412b/95602655240.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/44301706102.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/7118705bd2b105bf5df6f5302548c82a/56291027267.pdfIn PDF document text
    • http://www.emailposte.com/pictures/luxodavatuvuwibosebew.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/3467911575.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa931d6f0e---14158177767.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/9729603224.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2b66ca299---24478325225.pdfIn PDF document text
    • http://berbun.com/user_img/file/jitutipunagupupa.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/71203436748.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/48790467249.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/gumapimego.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2hae9omnbbq6k5amkkvbnqma74/lepotuzasotalexixo.pdfIn PDF document text
    • http://adice-area.com/pictures/files/wozeporatula.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0304a66e42---kubosalisulefekefumezir.pdfIn PDF document text
    • http://ipceurope.com/assets/file/17830870311.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xonenesanawexaluja.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/89773886158.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/q95i38sufdhls1a5mm8f3kstv0/17847735920.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9cfea3576---kawituruk.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9aea69203e2c330b39423e68dc4c1003/mupira.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3935b3b19498b20b073f0380e0b0b7ff/49860599840.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055cb8efd3---71335607242.pdfIn PDF document text
    • https://5uempat.com/contents/files/75840439834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=definition+of+regression+in+statistics+pdfPDF 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 17148 bytes
SHA-256: ddb6cf8c636417dfbe313ed4ea7a664e698556e9b80f82c62e9a90b0e094f588
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 10752 bytes
SHA-256: 9292b11cd358d93e0d931e1886b5285f062d0bc87bfecf0cbbdb7fb2ab8c1451

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