Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d154d01a250158c…

MALICIOUS

PDF

107.5 KB Created: 2021-07-21 00:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f8c14cf834bc71e515cba9d550a28b3 SHA-1: befdb72e5b30a435c3cb5e25903e9bc4b094bbde SHA-256: 6d154d01a250158c51920cf9d30096af056a43322d5000fdc9512e68eb91bc15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krassimirtaskov.com/userfiles/files/49650170282.pdf
    • http://podiummoda.ru/userfiles/file/96280939520.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zajaduke.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e2624d85f728f7c9143643c04c765d0/10856089146.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kanipafus.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9lt1imss7288j50qh302fna019/64603880482.pdf
    • http://deeringbayrealestate.com/userfiles/files/puferagufirasakimem.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda34331eb---72972595452.pdf
    • https://festival.bg/fckeditorfiles/file/69365842313.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b34215a0986---2505642474.pdf
    • https://hunde-katzen.at/soubory/nisururalerobefore.pdf
    • http://dahchen.tw/userfiles/files/nadikesifotuw.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/73902831759.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ngak9bnj8vjl4tvse225fipgr5/63046561836.pdf
    • http://bong-dem-long.org/upload/editor/files/rujipetemir.pdf
    • http://gioiacompany.net/images/upload/file/75716581314.pdf
    • https://ms02bet.com/contents//files/20899187940.pdf
    • https://allcreaturesinc.com/files/files/70923378983.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39269ca82---21132681682.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8768e1b36fd851bfd2ec63a45b6e66eb/namajuxiwitogapowejunusu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991b9b4a63---mupokixaj.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf730d0933---68098868008.pdf
    • http://cathugo.de/res/wysiwyg/file/xajixorowuvimeduxa.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/f4a8fbc54417e5e6afe8c97cdbcdc3af/44006953228.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67fc034b3---nugekemazefuvobuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=brewers+seating+chart
    • 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_off00014256.bin
608b9635a053c07647a1a9447bdb7700fd6adabed4271f83cfeea6556dff772e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14256 10484 bytes
font_01_sfnt_off00015a35.bin
e43f8d8082c62ecbaa723d7f350d37752a525d9eb58eac3dc5bdf8823b113053
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 17908 bytes
font_02_sfnt_off000188fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x188FD 16792 bytes