Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d1b9e5974cfb13…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 17:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df772d30bc7d6718875fb0991ea62179 SHA-1: 2a645ca46c080145b2bf4c555d2c1d814f5d83d2 SHA-256: f6d1b9e5974cfb1319f66647f795d6ba61f3c77e34eb71a437709d15d032c55e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, suggesting an intent to lure users to malicious content. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6488

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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608767c3a6b31---60282829429.pdf
    • http://reichspfarrer.sk/file/40925082109.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b3e41e37---sunuwigivo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/futfa3onfke96136cuknc8atai/59887839674.pdf
    • http://amsaneeraus.fi/userfiles/files/xunar.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c3ddc220---24865487528.pdf
    • http://xn--e42bt3l.net/upfile/files/73604033841.pdf
    • https://shih-tzu.ro/files/file/baruzegiziwibiwa.pdf
    • http://studioboscono.it/userfiles/files/55322013184.pdf
    • https://xnkvinatimex.com/uploads/files/xigipevamemakalovuxevamer.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/70083368248.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160759064ae6bc---vuneredapoxiv.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ceef6575d2---27720798437.pdf
    • http://pinturasoltra.com/images/slider/files/tisomikome.pdf
    • http://wsp.pl/userfiles/file/77859823540.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6caa675b902456458bf4d0bc4555022d/vekuzuvutovuwilu.pdf
    • http://fixafilm.se/userfiles/file/buriveviveloxomisu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vm13qesphdb88sqft9k5l4gar1/jepazosexilora.pdf
    • http://2sisaccount.com/userfiles/files/29457692102.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f2c232e7---gebam.pdf
    • http://narcisse.sk/editor_uploads/files/tusiruxovapokevume.pdf
    • http://diysmart.net/userfiles/file/dinafamusisitimeginem.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b979c75e5---13951779250.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dk3cmqe37e9i8nk1a378805p51/zowelozi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=greek+new+testament+ubs+5+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_off00010043.bin
635f2d7f4ab208cd36b8a4a103e07861626f25bf12e6c0da2f61faa9546fe671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 19556 bytes
font_01_sfnt_off00013375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 16792 bytes

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