Malicious PDF — malware analysis report

Static analysis result for SHA-256 4250ca68a3085db7…

MALICIOUS

PDF

97.8 KB Created: 2021-08-13 15:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a1cbee61f347d03603995c20f99e2d SHA-1: c63ea14b10b6243d4e079e1bda36ce2d144747cf SHA-256: 4250ca68a3085db746370908e31aee3c8907b704ea3e4b43b0501aa33ac8de63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://agiusfuneraldirectors.com/files/file/denezaw.pdf
    • http://naszymsladem.pl/upload/file/zawubesajaninivu.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/9079289913.pdf
    • http://sushi-belovo.ru/files/didenujo.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750a6a297c---36969251932.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8302afda2---14934048168.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdf
    • https://haciendaloscipreses.cl/upload/file/75330830922.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9qpf55mocf7qlp20944bap036u/xotejisolazurek.pdf
    • http://keralastatetailorsassociation.com/userfiles/file/51144436573.pdf
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/mavimesetetuwazepix.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vh4o00ck1skqn9rlu95i5o0ie7/99765776597.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cc1bce1792dd719938a4d46a61e36ea9/pevowidokabu.pdf
    • http://choragwica.pl/userfiles/file/xukakivibuxejam.pdf
    • https://istocdukkan.com/userfiles/files/60577245828.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74356a26ac---xemekixuwesataxozoj.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00d8c8f2da---pimawilis.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da100640d4---68672847045.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbf9f20cc---fuponejijusogobiwuwekazil.pdf
    • http://dui-antidote.com/images/userfiles/file/bepotetanoderolobinufanu.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6b466828721042ea028d6cf0607bb4f/48036167553.pdf
    • http://thuephotocopytaihanoi.com/upload/files/18928431091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=are+frigidaire+french+door+refrigerators+good
    • 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_off000119ba.bin
8a3caa8727533bcac38e540190643019031c80502d63e7c8219e37e255442a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 17752 bytes
font_01_sfnt_off0001479d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1479D 16792 bytes
font_02_sfnt_off00015fb4.bin
ee1a839889a5416797f955529771c274bc27e870acf78e03c00487521af732f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB4 10692 bytes