Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7bc6cdbfc9ea51…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 23:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b293158c748ebf0ac10bc67f5355402 SHA-1: 4005989db4884a73a79c6f181bf290ad70b502d9 SHA-256: 3e7bc6cdbfc9ea5193e0eab4e155ebc96fe80d576058e545dc030f6e891e0308
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=baby+shaken+syndrome+pdf PDF link annotation
    • http://laserinnsbruck.com/static/65529098445.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zepixolipumiri.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab95401d0a---muzejala.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab19242df95---dibubese.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/tidis.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/10926974478.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/26899429745.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/35751819229.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dde82f1bc---42662608066.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/17484754002.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/43227023624.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tiguwijuzelolezoki.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ddfd8a512---lutawujojedipovapigodafi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607994b3f0de4---28055800526.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9915cd39a---rutekodugiwetikatisum.pdfIn PDF document text
    • http://jechtinger-wein.com/jechtingen/files/20449408553.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160953325e1aa5---kubavajotofojebuviw.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/5218826311.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875e256500---62925180976.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/j6646ism8hkvprqcv8ru7dj0u2/fojanir.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b0d47fd34---depigejisatapijode.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/7a26c120c4ecd6db8631f690d95964f1/58306195066.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a50855863fe---15580237117.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/f9e0p2mvbvb596pug9c4sv5jm3/zutoliwegula.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/levumenodoxofavekivetan.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_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 10924 bytes
SHA-256: eeb1c8ce2d31c5a15c67e7cfa9620c3c534267a31e9e7d1a403d8cd831b6a773
font_02_sfnt_off00010d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1B 16560 bytes
SHA-256: 151ed5d7018368bbe9799eb4555763be9886e7e482677018e24c0e7661f43a7b

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