Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7bdfb05470508d…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 18:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b6fcee6552e79e4615c4c53a5705b99 SHA-1: d864ebcc159ec057d71043c83f63ccbf85ab4a54 SHA-256: 3d7bdfb05470508d886727d7fce7d26de607ed55018a05d13e5966cecc178090
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9403

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://synerhu.ru/uplcv?utm_term=camera+developer+android
    • https://adtw1.com/ckfinder/userfiles/files/85855113377.pdf
    • http://dailycan.com/userfiles/files/22451036190.pdf
    • http://amphorabeautyclub.com/campannas/file/nonirigewavotezipaxop.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8bf8eecbb02d06919e2d3d97a6d1c7d1/49167885752.pdf
    • https://iohrp.org/f_files/files/sobanulafibesiremukegi.pdf
    • http://skupka23.ru/upload/m/patutukidetej.pdf
    • https://ibrahimkoc.com/images/Media/files/97143024532.pdf
    • http://onnetsolution.in/userfiles/file/doginutap.pdf
    • http://indecomavo.pl/userimg/inc/89697499018.pdf
    • http://foto-preiss.at/upload_files/files/lubizafebonadenox.pdf
    • http://glassick.com/userfiles/file/jaditiru.pdf
    • http://tutek.eu/userfiles/file/mudosaka.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a6hhn296bkmv24epm64lgo3ce8/rakobosepujepikubi.pdf
    • https://1tlstar.com/storage/uploads/files/gubamojidewovedikuxiwujol.pdf
    • http://thienminhgroup.com/uploads/userfiles/file/66915947505.pdf
    • http://dakmoto.cz/obrazky/file/jogefewalafabaxal.pdf
    • http://alituncer.com/userfiles/file/6277517442.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/747ed8a1e78ff0bd9042d6e21537b45c/30430257150.pdf
    • https://marathonroller.com/userfiles/files/31572874759.pdf
    • http://bowlingkillers.com/imgdb/files/80287819543.pdf
    • https://lorus.rs/files/reramikitogitiwamojoguti.pdf
    • http://dj-venci.com/uploads/pages/files/29948540209.pdf
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/50162966443.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_off0000c0b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 16792 bytes
font_01_sfnt_off0000d8c9.bin
45499575ccd3bb6bc6cb8288e16778fb823265bd3b2a29f238f9660dab9ba174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 17788 bytes

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