Malicious PDF — malware analysis report

Static analysis result for SHA-256 5919468d3bc98da6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 13:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0a1f60bbacd99d2c541770bb1a46ec3 SHA-1: bc681f32499565653d19468b519830e3ff523a18 SHA-256: 5919468d3bc98da64ebd8743317a024bc6b97054497efd49ce0780b48425c2b2
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number in a deceptive context. While no scripts were extracted, the presence of multiple external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious sites or engage them in a fraudulent phone interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://noelex22.org/userfiles/file/budediwidegunafeb.pdf In PDF document text
    • http://westernmaki.com/uploads/files/resikopatabewen.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/42360046827.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338287d094f---18027285673.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/29933563304.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/73109287235.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8184a39b3---35948230862.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/laxazajibi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e8fedf94---69708055554.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qr0imoti7lhp9fb6pfbo86pp59/7195006050.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/85284161091.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613761d73efde---mewew.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/21365302896.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d17vss2jiulf9qen47883cji88/jumujileduxuvotasarosura.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/56651236180.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/foverubirobudutalobixikun.pdfIn PDF document text
    • https://jobtiara.com/files/files/kovogele.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/vesatalaro.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///49160389085.pdfIn PDF document text
    • http://dsagco.com/Upload/file/30455957098.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/gefijume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+mobile+device+driver+downloadPDF 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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 17336 bytes
SHA-256: 0b374c7ad0c2c405e0f5613e8bb5a0000686dba3980669bbc485bc0909960e93
font_02_sfnt_off00011cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 10540 bytes
SHA-256: b53aea7330800a500c1a850c1846dc71404276aaf7f92d247877e5fa4b558b1f

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