Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea8d0f8e3774aae…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 21:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcc4eae2fe6e688acfc18c8aac14aa50 SHA-1: 9651bad58d1434dbb2353c299bccecc8c3be68df SHA-256: 3ea8d0f8e3774aae0b81ecc7a7c8d27bfc5331552fc0896ae0729a78cdf208c4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=project+free+tv+mandalorian
    • http://thaimassagemodel.com/ckfinder/userfiles/files/98821084848.pdf
    • https://terrebleue.org/userfiles/file/80402165353.pdf
    • http://inteko-tula.ru/f/file/73532540522.pdf
    • https://threadworx.com/thread/admin/uploads/file/40977693722.pdf
    • http://amongelite.com/ci/userfiles/files/17832574932.pdf
    • https://webmakler.org/userfiles/file/30571973133.pdf
    • https://giverny-bkk.com/upload/files/nifogu.pdf
    • https://ibrahimkoc.com/images/Media/files/nomigegawameg.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b411c28a1b---41759083730.pdf
    • http://aurora-c.jp/files/files/kapuzijisisirabebirunen.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16135096d0cde0---99244728598.pdf
    • https://membermimpi.com/contents/files/16212437237.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/waxegaxixeba.pdf
    • http://www.findvoters.com/userfiles/file/17634620926.pdf
    • http://driver-jazda.pl/upload/file/77275528967.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zawubifadam.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/63919280731.pdf
    • https://lazeo.nl/userfiles/file/satikulogukumavu.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/93235703118.pdf
    • http://connectcontrol.net/files/userfiles/files/sarijusegoni.pdf
    • http://bycongroup.com/UserFiles/file/40476767457.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdf
    • https://www.karelo.com/uploads/File/65330359403.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_off0000e26d.bin
e89e37b7c55ddd710b5116a7cc4f17d02f245f26bce310d89ce13d8396e26e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 18608 bytes
font_01_sfnt_off0001127a.bin
99aa6165b6c7ab5becbfb6073350da7a225dd617c6a279a208f3f60674590008		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10664 bytes

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