Malicious PDF — malware analysis report

Static analysis result for SHA-256 f275c70a08f2cdd9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 05:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4be5fe3dacf6b9d10316222db2b56a9 SHA-1: 4151d34eb6cf799a4eff9bd706a1d4a9ee9ddc85 SHA-256: f275c70a08f2cdd9b6b52f6d1b0a9f72d3cbc0672ffe2d17fa77f012a7dabe11
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially compromised websites and hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://itagqatar.com/itag/file/files/81553749391.pdf In PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96077190109.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210903103604.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/lefobodefe.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/2112973245.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/gexezasejisuvutanex.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/sibejajizuligiba.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/67687197251.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kefaje.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/tojukaxosusekimonuti.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/1242071804.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/67030664619.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/55003267003.pdfIn PDF document text
    • http://talesma.com/E/file/43554056488.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/29296114540.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/dopururoderujarevozitedid.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368989c4bc4---jogixesokega.pdfIn PDF document text
    • http://coolscape.info/images/files/88791355121.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea37384827---repinin.pdfIn PDF document text
    • http://banquat.com/userfiles/files/wizuselekaved.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/35917668822.pdfIn PDF document text
    • http://kmsenior.org/file/files/66315529558.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e960e5fb6---jaziwenefofejatexunaj.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/84491669757.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/81871572742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=curtain+wall+revit+familyPDF 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_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 10484 bytes
SHA-256: 52b9ea002fdb1bdd202c4eb499af751513c8ebef6a57c187d2a09c19f915b1d2
font_01_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 18744 bytes
SHA-256: 3132439c846805af4d3a460a2ecfebd70f2bcf87abaa8c717cdfc4978a2ca75f

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