Malicious PDF — malware analysis report

Static analysis result for SHA-256 44aa7ec876dd43e0…

MALICIOUS

PDF

90.2 KB Created: 2021-08-20 11:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5f2d84001455df47ca557f5aa78dad2 SHA-1: 9f40b58ffc38572bf0ef2f8eefea48ef5bbadbe4 SHA-256: 44aa7ec876dd43e0f497d9f112e1edde9ca486cd355f07f1576cc43629a6c896
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised or disposable hosting, suggesting an intent to redirect users to malicious websites. The presence of many unknown-reputation URLs supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=camp+half+blood+confidential+pdf+free+download PDF link annotation
    • https://thaiwoodengames.com/files/upload/files/26702720520.pdfIn PDF document text
    • http://susanjeske.com/clients/82887/File/lagawugot.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/71625825614.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/cf4e78ab8217ca1244238e92e518ad16/monisezimusizazarumin.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/ribuzebikukilajuvenur.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970ddf1829e---44203278051.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/pigenugivuwuwibozekezod.pdfIn PDF document text
    • http://8njl.com/userfiles/files/12604081612.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1610e732a2564f---46122464289.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff6861e83---23015584855.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7c92f346336601c9e784bbb4d5e0de66/77422984185.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/mukigevuloxusaxofobe.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kafadoxatefejijokut.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768255aed45---40367642026.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1077f8cd---34509584503.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160701829ee686---fewetifepipun.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/gujab.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/30146744549.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wezemejavusamemajake.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/81924231902.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7eca095---35986246251.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609771ff46c3a---29272805798.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_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 17264 bytes
SHA-256: bef785890850862848b9e9e00b08289b3dc127057ee4b6d65958928ee7dddbf5
font_01_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10972 bytes
SHA-256: c1b383e9250e270d26b6c729559b884b99ffb19b680b1610979809120a21457a
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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