Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc3b1c46961a8a3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 12:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b90b6b087b1af09e71e76dfcd06f255 SHA-1: ca71300159f0f39be88a3d03d14b74736c087943 SHA-256: 9bc3b1c46961a8a3f893bc1ad50029b8ed16ef50ded441ff5da247235cafff4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of phishing or malware distribution lures, often delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b4b558143---wilopegivanamivejoxo.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B590E2D8ED4.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/16090943811.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2c3c9f8c---lufowuvotomoluxuliwom.pdfIn PDF document text
    • http://mega.kz/media/upload/files/77229692684.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/15ccab194cdb18606654b33328f6cb23/1132655921.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hnur3nkrg54g9lnhnscmqsrer5/4660385765.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f42e00dc3---642982329.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d4ff106ea---82054645907.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/10194638714.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/07044b5a8aadfbe84d739dffb0600cd4/vuditejapirifuni.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1518a34791---26531917980.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c456063711b---wemegufetezowotup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db4bb64b017---bumosovelukilunol.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/80930870667.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f968d391d---4966268380.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7f0f2f8778e8558db5fc9dda1d1d96a8/90702084300.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a966c1b2d4c56b3c599a05b7b578350a/11065743464.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608287509a0ef---88694896823.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160872b8bd74a5---28999647685.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9rnl7dg3dbhncdtuml1obsd6ml/nenebuvib.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/wopufejonaki.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607630c03f7dc---zizevuzazowutopavixukemam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=effectiveness+of+advertising+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_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 17808 bytes
SHA-256: 15bdc66673cd566e5c3af1706f1d35ff47d39269aa9095029fad9f1fe770ac1b
font_01_sfnt_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 10796 bytes
SHA-256: 7eb5f67e1bd3a78fbfd2eb3e24a886f3b0cdf904c4c2f3d00ba2b1b88dde58ad
font_02_sfnt_off00014925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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