Malicious PDF — malware analysis report

Static analysis result for SHA-256 925788c4d8348f8b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 13:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c86c720ad2bc3baf9c496136eee79d0 SHA-1: b125acaa3595da582fee8d8b7244e9555eeff080 SHA-256: 925788c4d8348f8b0b27c1cbeeead2003be38efae424acef35ec11483d024713
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=pokemon+soul+silver+rom+freeze+fix
    • https://fenixfalt.com/userfiles/file/92194478151.pdf
    • http://xn--aknmedical-yub.com/uploads/file/16683900390.pdf
    • https://ecoverservice.be/gallery/file/suxamuxejikipuzupiwu.pdf
    • http://hotelrealerimini.it/userfiles/files/3831614164.pdf
    • http://lerucherdesanges.fr/userfiles/file/xitepuzumiwe.pdf
    • https://anctools.com/ckfinder/userfiles/files/93666368586.pdf
    • http://permagnet.com/upload_files/file/210913130604862017079jyd.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd208c6f75---kumiminawupowazukaposu.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa477318---34604454493.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/sorusuvigupajunize.pdf
    • http://stjconsulting.it/userfiles/files/dagidumowegobidepizu.pdf
    • http://prefinancovaniehypoteky.sk/res/file/kotafudelireralimik.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210911_042658.pdf
    • http://teplolux72.ru/upload/file/bimezujoji.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69143fe0d---palolejukotevukes.pdf
    • http://alptw.com/images/files/tudomumubapefuvegarizow.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/varijezobaripiwufida.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6a1471ab---81634767874.pdf
    • https://ccskin.com/geektic/files/50965233416.pdf
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nofibuwutizikemidekut.pdf
    • https://dichvumayphoto.vn/webroot/img/files/83744758330.pdf
    • https://betenenergy.com/sites/default/files/file/11177754375.pdf
    • http://hyundai-baoloc.com/luutru/files/64645765516.pdf
    • http://viviapalermo.com/userfiles/files/kinukufodanonuzedopujej.pdf
    • https://appvid.eus/userfiles/files/tivimokidinuzadukuletisim.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3a45dc1---62613647594.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed36.bin
6b0d7a80646c10d60a15fbaaf38c05989604d43c2372a53bfb3ba7776e084e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 17272 bytes
font_01_sfnt_off00011a71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A71 16792 bytes

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