Malicious PDF — malware analysis report

Static analysis result for SHA-256 8096883f4e22aad3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 03:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc44699d4fe717aa4ee457f4f9682371 SHA-1: ba1de8f1939dafdae1db12dff789df3f92bb12f9 SHA-256: 8096883f4e22aad3775ccfd85bd6476e6f78011a8567b68e338f60f5c1111515
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://drsubhashawale.com/ckfinder/userfiles/files/numixomebetezejufepe.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04074f781d1ecad8ca51619af614697e/jopetapunezixisoda.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/wugawatilag.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/99139415055.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090283b3a98a---donogeg.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bozigijigotidesulova.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976ef32d319---22823474105.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/46237083726.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b354bd3d01a04fdc58414d8594cd4847/43709231359.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/21535dfee1e7e05b63e908034607c819/39753032845.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1hklel44lusj894aldg5rp4r3s/13590167423.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/16806048512.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vajukanoxunubuvama.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4896ec50a6f7fe82e52005d0b625f5ac/vutebebamurosomamozo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/vovob.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/jinonelobesofagevafo.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/7710636445.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/71978022516.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/20498490901.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vm5df4v0e5phes79ce9bjoo7fj/lejabofawa.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/70045747822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=thomas+calculus+early+transcendentals+solutionsPDF 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_off0000c69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69F 17448 bytes
SHA-256: a64230bbd2d9bbf031fc7755c069c07ba2e86887f0da65298595fd7ecd1b6e52
font_01_sfnt_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 10812 bytes
SHA-256: e48cf91b9f2601d21bae20783688e6cb8d54a8a33c26518d3811633284c1ba9f
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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