Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bfef755ef54c9f…

MALICIOUS

PDF

94.4 KB Created: 2021-07-08 00:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 508c6a330ecde9e8ac9fc659db3c78ae SHA-1: 3e0e294b5dda40aca58ac8ab35bd20e2014f8d19 SHA-256: d6bfef755ef54c9f99bfbb133af7041bedca05b77bcbe9bab18dcdd1c791a8d8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of multiple distinct hosts and the use of disposable hosting further support a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cd7b9df3f---lekonadod.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/66306557279.pdf
    • https://catbasailing.com/upload/fck/file/58505628136.pdf
    • https://cplastik.cz/data/cms/file/17858559465.pdf
    • http://kcde.kr/userfiles/file/mamejeteliwoxofe.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cb9b17abbbf17c4686d6e81957e3d81e/1010243476.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab10077a11e---70562034013.pdf
    • https://vettercycles.ch/userfiles/files/82184077174.pdf
    • https://angkortaxiservice.com/userfiles/file/xefepokozefijarumif.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160711622b3a92---75237765765.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5410562e0293b963d98a46ba78f543bd/21467383745.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/dsclrvhn7elkhbb8hevsmnkbg1/fanepanuradoloxutid.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/687451f923b503c5e2509818d9836425/mudesuxivotamu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bffea711433---wexatiragawefi.pdf
    • http://czechdidgeridoo.com/admin/upload/file/fivubobo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607693ff64982---86739659070.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ceacb34ca---majil.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f8cb6005ef8c5bb1b9680413297b5b46/80206051828.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a730ccd138d---dubodidibisowu.pdf
    • http://mdc.ir/ckfinder/userfiles/files/94706542891.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/12360470836.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/f098552d08e9a4626caa5eb48ae0dfe8/39579564246.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb41666948a---10504376926.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47e8b5f7c---fivogujiti.pdf
    • https://nevisnews.com/userfiles/32731171066.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=famous+two+chord+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d0b.bin
ad2e7d3790784d0d47e339b7224f391c88642f81391277bee479212e08b0738e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 17996 bytes
font_01_sfnt_off00013bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFE 16792 bytes
font_02_sfnt_off00015415.bin
0ee36edc7ab0a2847e70a1ec52be624615112b5466e8ab844f7f9a14e457397d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15415 10712 bytes