Malicious PDF — malware analysis report

Static analysis result for SHA-256 d602acf2b2a1c900…

MALICIOUS

PDF

91.0 KB Created: 2021-08-26 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cb2cd7c0e183bf0a0db38c010fe05a6 SHA-1: 8d6ab3a2f3b2e0e2bf50e1680d870848623dadb7 SHA-256: d602acf2b2a1c900797bc9f1f25ca066f54ef4c5164a6f8891824fe9eb0e9235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=ben+10+the+ultimate+enemy+part+2 PDF link annotation
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdee81e5d---xixit.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997139c21d8---20273210006.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e187e04f---dasepolovi.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/debomopa.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/9411325775.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/940e4ead0e3e207f8e53bc4a1418fc28/xabugipedoladev.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/luketifofuzaselovabizovok.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eace1c707a---81039928883.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nipu76b3jf5qdidqu7vio75e01/dagaxomejigafubabevozu.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bulurolemujoza.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/pegixozedurew.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/65eb6017d975d79c4e7c4fddf6cd8d95/94988338010.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/nadosisatojugudasinefig.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732139ad0d2---10665424909.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16111936097a60---bidokanajupana.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/45129251404.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/votawiwujategi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tunamulamunudopuvovile.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/da01ed1b7a3fdbc7be2d44a409701934/folevopo.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/00209daf0b37b40936d645c2c9b792a1/kipimevemabufeb.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/91843745678.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee58ceb22e6---bodagonepux.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tbk9qnhj1qisrhhqpi9omg664n/mixopelusuxorakez.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/57140683145.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/punib.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_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 10792 bytes
SHA-256: 081f2b1c5ecd304de0bee8390c969c6cf55ef14ddd72876666266613b20b9d51
font_01_sfnt_off000115d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 18704 bytes
SHA-256: df45b85b2bf3d8d500e6bc56674c2f940a09bc144f4ec5341bac3009706f9c5d
font_02_sfnt_off00014562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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