Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cfd1cea1166da3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 16:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edceb0dc6838197c311d7c3bfe55ca50 SHA-1: 4cc3e94289badc5fa14e946ac796ae8ba6665af3 SHA-256: 92cfd1cea1166da342c73ef082612fe5a751d51e47eea00a3449f520f261c18d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable domains, likely intended to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate effort to obscure the true destination through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lso-msm.fr/userfiles/file/fevejilukinitevevowekor.pdf In PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/9541319344.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161113fae00bf4---69109086050.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5cebffbf---1850148549.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/nikidikipepetux.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/99172606788.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078020a0ea34---92310472631.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/1f5nq6jo3rh2pa0d9b8abbknmh/vosijanitisepus.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079d2bf85d62---xavojusironakivepaxepobe.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/bofirujov.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611449ae2ef48---6077132409.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/katemuzepularifos.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/47275805709.pdfIn PDF document text
    • http://bociany.sk/media/file/jabokaso.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160767923ca469---muzuduta.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/81936119727.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cda2d9c02ba---guwovuviroxuxadi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/remug.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/8992097182.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/vadob.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nikiwidusupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pernikahan+dini+dalam+hukum+islam+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_off0000c190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC190 10736 bytes
SHA-256: 08fa18858a7d90264004cc4d23616329aa92f2f7b578998c3b09bb3ef2ef62eb
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 15380 bytes
SHA-256: 5abf4c9a19d7f940303b5b3f3e1c14b18e2dbf504d4c4b10bfab408936e8ded9

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