Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da1bbe99e0dda26…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 14:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9b0470a24bfb584622f2b126980faa5 SHA-1: 075ef550620a0a8210f5289d53208d62905703cd SHA-256: 0da1bbe99e0dda264b1c4a68a475761b22c4bbec676b31026aa4f85b08c1b10f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=games+to+play+with+friends
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6dc7fa0k33p99vbrg6tcrbeplr/93268781568.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/47159715474.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/4568479442.pdf
    • http://saigonradio.com/userfiles/file/tafebovo.pdf
    • http://www.offshoreyachts.net/web_upload/editor/files/89488591071.pdf
    • http://taiwan-casters.com/userfiles/file/munitubiwoporibukalidob.pdf
    • http://1-sanya.com/blog_images/blog_/file/ripumulodenulisisom.pdf
    • http://thangmayedex.com/webroot/img/files/fimutirapira.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2df894f0d2c02b51e41c8f83f76bb1a2/35573756364.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/72029146736.pdf
    • http://tw-tms.com/uploadpic/xw/files/50104561768.pdf
    • http://www.uc-kushiro.net/images/library/File/81690022186.pdf
    • http://eubeer.vn/uploads/files/78869910459.pdf
    • http://www.santamyoga.be/images/file/sorivowapuneme.pdf
    • http://stepasidemedical.ie/images/uploads/file/25056143127.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/faderuvarilufizarewolere.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1632010025.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea500e1af---tasijopufurewagexosun.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gobetodep.pdf
    • https://northwestconvention.cz/data/files/wagitod.pdf
    • http://allgeology.ru/ckfinder/userfiles/files/65367191654.pdf
    • https://dudikom.pl/userfiles/file/43537022069.pdf
    • http://philboyd.com/redawogavunewagupikugisa.pdf
    • http://randoquad72.fr/userfiles/file/lifojelebefokabewezavaj.pdf
    • https://premium-house.uz/images/file/41293481029.pdf
    • 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_off0000e51a.bin
8348168eb89f9ebe3ebe27ea4fb0bcb87ecccef455525aa3e3ee63522f62b3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE51A 18164 bytes
font_01_sfnt_off000114ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
font_02_sfnt_off00012ce5.bin
8bb32b4b9e1f680f7794c5c0158bcab2679d21ec7765fdb88ed75e8936bf78d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE5 11000 bytes