Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b270207e42116a8…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 09:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b0f4f412be6a7e70aa837fd36b45281 SHA-1: 94e11d596ff7dc82f92ba49e98c194e8f8129a26 SHA-256: 1b270207e42116a89b1c3010567970937aa01abf0b57ed36bf8cb0d17141b9db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or SEO-based malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://svetplus.com/userfiles/files/terejobotaviwamut.pdf
    • http://metaglas.kr/userData/board/file/fezebupifefuvijagod.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160739ed9a2333---9617133050.pdf
    • http://beachfirebrands.com/userfiles/file/53946170467.pdf
    • http://portalcom-b2b.es/img/user///file/_0033187001619909128.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2198b475bc03c1d720a2d168d02b4bcf/27858657603.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c60d262ff1a---juviso.pdf
    • http://teplospectr.ru/images/files/5141467371.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f75225680323560dfad2782424a3627c/50416876124.pdf
    • http://nuraski.pl/wsg/userfiles/80449494098.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c644613557---wogaxapo.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c829d762da---8897949630.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a373c29da02---48615370126.pdf
    • http://www.irrv.org/uploads/files/53548595246.pdf
    • http://hanasushipickup.com/uploads/files/10749463671.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfac7d0e43---44676619493.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2821c6cb2b9b31f1db6c97c12b6263e1/17384478006.pdf
    • http://turagent007.ru/userfiles/file/rirezibikezeworijubupim.pdf
    • http://beiks.info/public/file/kuxozaponagakaretovel.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/upnc4r1g0aj8mqmgetgdomhrdg/fikofi.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-20/20210620194150906285.pdf
    • http://dansensvenner.dk/imagesfile///juxube.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6952a62d---86504714717.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kifomenimufewipure.pdf
    • https://aymsoft.us/aym_image/files/fonawipaximegofemonelewe.pdf
    • http://pensjonatagat.pl/userfiles/file/zolatumutokunatikulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=detailed+lesson+plan+in+tle+food+preservation
    • 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_off0000f474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 16792 bytes
font_01_sfnt_off00010c8b.bin
265a38946933dbd6fe75f15659799a24e4dc6632f09369f1f090e700098c55f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 10560 bytes
font_02_sfnt_off000124b6.bin
fc3b1e8c99af1fa5fda92dae4bb7b285d78397f127b87d04975ec43416397c02
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 16884 bytes