Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f298eff33c0f57…

MALICIOUS

PDF

76.9 KB Created: 2021-08-08 20:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fafa61f860c53f9dec19da0d264e57e8 SHA-1: 3cb6779e97629f2cb8e20667d9312961c5d0bb99 SHA-256: 42f298eff33c0f5783641ff9b5953d72cd3a2c03bdcb38a19a0c3712295e713d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=casio+ctk+411+manual PDF link annotation
    • http://iphysiology.ru/upload/wobibexozakawaja.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210721_043514_5461.pdfIn PDF document text
    • http://candientushinko.com/images/file/turosela.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a818fb2aa48---zijorogivolodiwujuzupire.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/90465972827.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/mebazafivilupabofowow.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/047b38655021cd5267e219a2bcdd5f53/navufekovofuze.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/25e50d58317a03c1693a171839c7eb75/rudosejolanopabobim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6449655d---80912461744.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xirenimagimis.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/p7olpue66n2fmh451pb5t47b32/zesagujofexupowowakoli.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eead6539e4---nidumovikananoxos.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5490ae395---zopotinujafekipideriwebez.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/rozirig.pdfIn PDF document text
    • https://noddy.nu/images/file/578001651.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210626171424.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/butobabiwuzabimedemuf.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095012ae2215---64521091274.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/ruzukenupupikirakufufub.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/30576832688.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/66151149448.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd3050c86---76626995925.pdfIn PDF document text
    • http://crystalcleanwindowsmn.com/clients/c/cc/cc5f591ab25ef7bbd7a205b431f39e57/File/guteribiwivugo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ff97e53281062c8424b71debccf3769e/61625182586.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 10512 bytes
SHA-256: 91fee15dc3b959056edcbd7a6a85aca776c1528cb2c1f4df3e4cea26be62b576
font_01_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16760 bytes
SHA-256: 146e26ebf3eae51d0b04ae08b4d0699da4d2b804d205493ecdc36b94653aee4e

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