Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb94cfd8efad3b82…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 21:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c8dc3a747459210b90f7602c448d566 SHA-1: c1aef3adc40c063ff5a40a13c223876d679ee790 SHA-256: eb94cfd8efad3b826f22869b2fea68b9a6d287a61cf81d3b34c1ffacb8b9550a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The PDF structure and link farm indicate a tactic to obscure the true destination and potentially evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4362808121---11169242574.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/funoxijoxinososorusobemes.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4a96ff9bae9b540d3daa7d9e7abfb64f/15159982377.pdf
    • http://altinay-law.com/images/file/jokizonaliwofapinudowi.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210520054205.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7555ddaee581ebf034c738600767b10/ximomavel.pdf
    • http://mariamozharova.ru/uploads/files/mololivalagorevogo.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/kesuxovorenunawuj.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11aa04c1---dotikapel.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b271676b332---78402506989.pdf
    • http://pixel-pro.ru/upload/file/negona.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e899ef0e0---jemowavanejabogub.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cce8458f---dubobulop.pdf
    • http://goref.ru/files/file/fikijo.pdf
    • http://hiro-seiko.com/upload/files/22804301489.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+is+wired+internet+connection
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100cb.bin
ec5a1b10c5b841a09429efa6d55f42eebebc1e6cc194a317db7348ab55220975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 17144 bytes
font_01_sfnt_off00012d71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16792 bytes
font_02_sfnt_off00014588.bin
f9275985ff1608571892d5012d93c88712f2623c29cd32ed819fe084d0001583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14588 10500 bytes

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