Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6584f8c5b2d5b7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e09cf4832be801159fd2ea89edc2842a SHA-1: ee80e27eb224e29597a105e8f45aadbce0a710b8 SHA-256: 0c6584f8c5b2d5b7f963c4d5e5dfc92e52243dfacd87722c0d37d20db3297972
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to external sites. The presence of multiple URLs hosted on compromised WordPress sites and disposable domains strongly suggests an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection further corroborate the malicious nature of this file, indicating it is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=distillation+of+crude+oil+worksheet PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d831723b1---19142586394.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/13396254815.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/welevad.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/03a3172eb31d04e5084da44459e0e165/63176933983.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zubojozeju.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c2bb304570b33db45aeb76f81ec3f826/71086139242.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/511fb6f3d95514d7f446fc6db07eab3f/zubenobakisibosozuwekik.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30de5676---vakoxuf.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/23629525288.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210805230449_0xoywi.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/70699806559.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/afdec7a5bcec588364a07dbd210a8fa6/9194211849.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/69256003286.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160927ab722afe---1385292555.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/labidorawis.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ghmgd6qvptgalj6bqeso40heqg/paziwifugu.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/70027179257.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d0d2980f---60692974737.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/86604055683.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086142c5beb4---kupolinevuzunimipu.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/91721262288.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6a4c70ef---xatogulaseregubuwodurok.pdfIn PDF document text
    • 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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 10852 bytes
SHA-256: 1650e7cb12fa35940d7e6e3a1be036c290ed13ed6b3253f7d6603d6f70900598
font_02_sfnt_off00010f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F17 19100 bytes
SHA-256: 5adc8082e3a8c5ce04059d9165eeb88a1e6ff62c14e5e466191c84f652d361ca

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