Malicious PDF — malware analysis report

Static analysis result for SHA-256 37467429bf30b446…

MALICIOUS

PDF

102.6 KB Created: 2021-06-27 23:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0170153cb0e2d80640ab1243701d52b9 SHA-1: 49b4342facfe40041938cf45c6abc4f5d051e945 SHA-256: 37467429bf30b446994d7484939c82c2bd06c04ff8dbdc4404bc731bb460cc22
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 6

  • 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.
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f609a71b90---54099698661.pdf In PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d67832e57c24a5a95a34264ab68068ed/17742095744.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdc4be5c0---togiraxatatetixizutujol.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c104c9d9---14885205973.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732ead1b89---zexirizovalo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775ce784d42---goromikesepejadugi.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/13785824450.pdfIn PDF document text
    • http://jaatkinson.com/userimages/nogabogomuk.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8fb7ba01---52768460005.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2mhfob4ss6v6dja8ilq9asql5t/57511739343.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f725feaa---livipepebovilafuku.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609831b2d713c---pokawolab.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kuxavemisafobivezozubig.pdfIn PDF document text
    • http://sam-global.info/files/file/roremibemubob.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/aiiubf03totd7a0a109df0jfm7/lebudalesi.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b79c0efabeb726176e09a49db223b2d0/niwesezu.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/42559102117.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416148f975---34269933443.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608325e8e27e6---9281386398.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/mesobiwozikojasi.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061721525870554.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/j4cnuqfk1v28guklv3o1537sna/kadivan.pdfIn PDF document text
    • http://strandedtattoo.net/file/pusilulat.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/zizosaburovebezozufurif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=coneless+volcanic+craterPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 10320 bytes
SHA-256: a70c6932df7388caf64ca53186278754aca7c623d95904ff41a396f81989ba95
font_01_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 18776 bytes
SHA-256: cee6366721360585432c3f0bd9d6ff665b3e32e784730647dc781e9189325b42
font_03_sfnt_off00016871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16871 2212 bytes
SHA-256: f2ef405584d3fe6f5c520dc86529a832363b69a4e14df6143adf6fbc59098d8a
font_04_sfnt_off00017229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17229 16920 bytes
SHA-256: 74d9d723c42c2705ee42890cfe767ca4ee4c8927e061065d1580f95e0b8abf2c

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