Malicious PDF — malware analysis report

Static analysis result for SHA-256 0710bd5252c849f7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-04 12:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6c19482caf5847022d37af13560aad91 SHA-1: 6985fb8cc7d9fb29ed9cd93f8ac3ec88034ff93c SHA-256: 0710bd5252c849f71591cd2cf045e1fdac45b523e9f3ab24b5c97e57372536d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary function is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://krisoc.ru/uplcv?utm_term=fikir+eske+mekabir+full+pdf PDF link annotation
    • http://designerhouse.ru/upload/files/wisokomedazenerage.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/13713973773.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/80538448767.pdfIn PDF document text
    • https://alohasafaris.com/files/30626303315.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/998227385.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/78955074780.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tudiluxulexewelege.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27bb82c3f7---zafedoxafudoburifimepel.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/wotobezipifilofinazajokuz.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/92432401325.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678ebb71bb---ziviwewurazumatimawedusi.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/60462006409.pdfIn PDF document text
    • http://simonide.org/userfiles/file/moxarobibaribo.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tuzemewozo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hq2oh87pset71b4e22ce4vcilh/40259741354.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612d246165990---xazufefonobiwatod.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607218e9d4277---67140073811.pdfIn PDF document text
    • http://funperm.ru/content/file/xedetozimejede.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zeduxexa.pdfIn PDF document text
    • http://sivam.pl/files/file/31667585267.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/61b49612f5aaf9905fc59ba0dae67d53/doluwegavekulezopawa.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/rrg411qos74cnpfo8m2233ih7f/bikomokidazumebipap.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/72649192537.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160736c1bc2a33---rodapemibonanijul.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 10648 bytes
SHA-256: 3feeb0f27352e0786d19918fad5d9c9449afc64e5109731fbf8bedf80fc1a447
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 15528 bytes
SHA-256: 8bc3ebb82d5ef2501e4395c6f06ed8262c4dad5ede125b8624eb78a41e5293a5
font_02_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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