Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ef22043dcb5eb0…

MALICIOUS

PDF

93.7 KB Created: 2021-06-25 13:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4aa0d4cd29d405e5628fcbc59dad583 SHA-1: 932f11e0b22f224af591247cfd28c04c274e12be SHA-256: 31ef22043dcb5eb0a760459c5c23e7533408e88dcb15f1480e395e204a597777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://nnkcreations.com/userfiles/file/zakiseg.pdf
    • http://zatacorp.com/upload/files/69080307016.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d6970cfe---xadopalonunugikixe.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/7f00d679624dbb22fa3c5b1800b9db90/50079803694.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d722a1fe98486b0a945793c3d74e9de7/34610921651.pdf
    • http://119hero.kr/userData/board/file/mogedujapa.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6cmrc963u230jp4u5n5jba1dgc/venijekejojipufolugok.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b66ce9597---37890771945.pdf
    • https://fl-forever.com/upfiles/editor/files/71340111348.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/57a262e376fab9e82627ccdb4456d2c3/bimogekovukavakaj.pdf
    • https://juhaszautovill.hu/userfiles/file/20344436383.pdf
    • http://nissanotogovap.net/uploads/images/files/36684880039.pdf
    • http://www.520amis.com/upload/files/27590200370.pdf
    • http://cycling-software.com/files/file/xofesutoxi.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe744d9c87---kefigodufizofe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scrooge+quote+i+will+keep+christmas
    • 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_off000109b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 16792 bytes
font_01_sfnt_off000121d0.bin
760acc0a9ab61351946a7d067b8af2e81ef8191d57eb686075898a87e6a778bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 11216 bytes
font_02_sfnt_off00013bd6.bin
8b251a45cfb27f49416f8303e50717bae58f22f2f755b166972c2047892d16db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD6 17616 bytes

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