Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a7b0bd494a65cd…

MALICIOUS

PDF

146.4 KB Created: 2021-06-29 03:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10f4d24ee1988826d447c043abe681d3 SHA-1: 323cf1f9195ef80229f30296eb53c69973c5dd56 SHA-256: 93a7b0bd494a65cd8a26d3050b9096ab9b6aaf52a24cba6902e10351e7e6dcfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b782464378c---pakipu.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b668cb6ee7---5943045513.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/55744203215.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/44fc23951635cdded62e959f479f76e0/33401378386.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9e280972735daf9602cfa704becdee1c/89861144053.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/52158921555.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0a0d6ca3---20150839623.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995eca3c134---8288718336.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/36078628143.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c150ed2c300---kuliju.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/litamujo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d701259fe61c85495501cc9c1f1da404/dunepewikofamadawu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gamugarapetopigujokegamuw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c0f326fa5---18122986844.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/viduziziropudipuxukusadet.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081618261ef3---momadozozenilevuxijetugi.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/tilopizewib.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1d65fc98---72307872198.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/banusize.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ramemenevarugazexakem.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1b88ca32---15457486206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=roblox+id+codes+for+arsenalPDF 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_off0001ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE64 31700 bytes
SHA-256: 16726d4dbfe586c3926f7198c92d06707b367217f3d7a3c86f6bed3a3d21cb5f
font_01_sfnt_off00020b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B96 10660 bytes
SHA-256: d1c31488ef3a640b988d4fd674b8bc27b8ba202b5dc567b003c0c9fe9e4f805b
font_02_sfnt_off00022419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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