Malicious PDF — malware analysis report

Static analysis result for SHA-256 b569e86bf0b0c4e1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a5e33231d35072af7d5bbb16033383a SHA-1: a9b8cdd48297b742bc184e2c82e0a9dfaba35745 SHA-256: b569e86bf0b0c4e1cc9712075079b3f5054931c93aa5cc480be40e391f37e4ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or exploitation, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fzsvybbs.at/userfiles/file/37991493955.pdf
    • https://advik.net/userfiles/file/4604938900.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/bovofeg.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/60459165132.pdf
    • http://em-ail.ch/pictures/2/7534469760.pdf
    • http://uralteplostroy.ru/content/file/93952597641.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161352cc67ff44---nuzalebadoni.pdf
    • http://global-leasing-management.com/uf/file/rokulirilurigufizuvomi.pdf
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/viborumimasodujifowudona.pdf
    • http://ehomerealestate.org/images/file/44787174431.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pgp0m1rmd0c5b62lftl6io48lr/lifikidupulapazeg.pdf
    • http://hantechwelding.com/userfiles/file/2021090715553173499.pdf
    • http://hangtatmj.com/userfiles/satagomowunudukodonax.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161495c8a38fc8---dajutesuvodos.pdf
    • http://serramentisiciliano.it/userfiles/files/pimuzulasazezo.pdf
    • https://verner.lt/images/files/7850313187.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161422eaf4ea05---kuxolawaxelirawagoruf.pdf
    • https://rh4-h1tapi-turbo.com/contents/files/46231556797.pdf
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/89529503105.pdf
    • https://aromamarketing.md/img/files/56218055869.pdf
    • http://daiduongmetal.com/uploads/ckfinder/files/sabuvabegavipisosegekoz.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/nuvebupugugusazuton.pdf
    • https://dichvuhappyhouse.com/upload/files/dixokugavipurit.pdf
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/senarijimunasovugedeko.pdf
    • http://www.darvidproperty.com/news/file/gobavalotukimelujolisi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+disable+power+off+on+lock+screen+android
    • 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_off0000b220.bin
7fb0f6bec070a38401ace0c9cfbecbaf97ac2b23b4bbbce79e7be4673beb9675
pdf-font-stream PDF embedded font (sfnt) at offset 0xB220 16472 bytes
font_01_sfnt_off0000dc17.bin
353f45e441f55b1f4d528717366c9497ccff4dad9743c0da41babd32c8b87c63
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 10920 bytes
font_02_sfnt_off0000f550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16792 bytes