Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45673f2a95eb74c…

MALICIOUS

PDF

89.7 KB Created: 2021-09-02 19:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6ec02697952b9ad8de8f97adb45a13b SHA-1: cfc336e61f82c1fea35eecad142b8b2ad7c665b8 SHA-256: e45673f2a95eb74cecad15fed14cc212b61b285944f447ace8f4ef93f69b33a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple links on disposable hosting and the use of 'utm_term' parameters suggest a link farm designed to lure users to malicious sites.

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 https://wastran.ru/uplcv?utm_term=handbook+of+biomedical+instrumentation+third+edition+pdf PDF link annotation
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/r64qutuvc1dsl0hsvc03pp32ud/56120800564.pdfIn PDF document text
    • http://coffee33.ru/archive/file/1163611975.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/33998904031.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64ae887cb---melemefobif.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/ruxokunugokubanegiguwi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b8f3b49f9---tinawuturisevojatujefet.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/2917057217.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/51147462156.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/49980453381.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/61396172764.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/likakilo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c39bc8cc917bbc7b4888821fa5d2db65/pizuzetirawapofusa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/93354fa367a62bf23864b1bd86e263fa/50945169256.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/546a3b660155eeb7568b4efd0b894f5d/6801063495.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/cnb0fcajimm564ktjio1fpgf6q/situdirokamiraribefusi.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/499276910.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24af4e448b---94261504458.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/30196141641.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/31802069730.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59869098221.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/rewulagogogawuvoku.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160845939f048b---fijuxogokenaj.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609117eb71910---nimokunijajere.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_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11208 bytes
SHA-256: 28617cab897edec4be68a7eacbcaa07b398e9b3f96594bd1cc792aeb6445d906
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 18184 bytes
SHA-256: 785a597ea9c5dd3047ecd78c5d0fef9b9a1bc84a43f419a0d8772532caef79eb

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