Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a20aa053e27a10…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75ca493effeb71b4e7e9073c8aaa64b5 SHA-1: 9d4b9f6b1b9e86c1b33e7d4e1a1c1977ab0d4803 SHA-256: 99a20aa053e27a10093f1216c104a177003b89ad48c283cd33305b1fe04f6637
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, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://abaj.cz/UserFiles/File/56420863319.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417bf041632---16920695586.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/pajusotawutapopedum.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/jigisirexutigitifuxof.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146af5742c10---wewolo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2eidvpcr4q8oa1putk7nol7gop/mojuwore.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/wejemubujin.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/forisujesawakivej.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/bofuwofefanopiko.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38093744145.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/89348663466.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/suxesegarinive.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/28106609661.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/wofug.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/5362835147.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/61698292288.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rrbespkqkqfnm0fqj5v561f74j/dejogibegobovojizagudol.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/mubikubakonoritez.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/620d345f0b850be5ae7f6504e5b4b290/kukelevaredev.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/36797885499.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574a68015c---85972310577.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/50080845925.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/sazabedijatubukovovokof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=windows+movie+maker+2017+free+downloadPDF link annotation
    • 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 10996 bytes
SHA-256: ae956f849d537e1c4f893ad2d7df0edb11c5d51073bb33af59986f7ae3996fee
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 16792 bytes
SHA-256: 4bb68ac6d7ff4c4c83ccd9faaaa4260a8aee6f5f2142883386271c9945a9012c
font_02_sfnt_off00011f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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