Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea7c0635ca3c2ce…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 13:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 005f8e81c0a1704cc247b96b99f4432e SHA-1: ca2fa9c04098f61191cf69097dce629235c62b4b SHA-256: dea7c0635ca3c2ce3ad26fdfa84b2e4b0f726d3483c706a9fa3408886e6d913b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for redirecting users to malicious sites. The PDF also functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to host phishing or scam content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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://allytemp.ru/uplcv?utm_term=12+week+workout+plan+pdf+free PDF link annotation
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f22d9a8e4e6f5df1d43a1a177c7f2de3/73800057368.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f956f3d263---sabivuvimagabat.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35214e4e62---vidudubilazebabuwuve.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/porixiluzulufurakugufu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7332fb491e42498e4311f9f688d9e07b/27619315036.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jinizad.pdfIn PDF document text
    • https://tavio.ru/files/file/56334438446.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/mewijusevegan.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/5e354d287a3b4a21d27c2086d39c347e/nesujovenewevajinaw.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089cb97334dd---97281436204.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134802347899---tujabexa.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/vuwurirajikigi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7n9pbcb1ocgc82u9nndnlg4a64/tanojujakexemiso.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v7sqret0affaqa035789i2rlp4/70552991078.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/m9q7nttrmor7ie46ahfa5s5aq1/fuzibowovitagalidat.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210822091834.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/22728973703.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/32e94e882422b56b90e494be926dae29/xisizi.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/benipawinawivinojafu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa18ca8599a2783687564dff8d132608/xogalarurosode.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/ed6c9a5550d8ad8c5e9f1ad7ffcac626/nivajinovexegug.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/rbktlv5kfe1thu2qb7l2156hm4/50952850879.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c3cf8a1ef---koropav.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sidonefotirepel.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3b817386---kajepowexazipesemukupurox.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 17248 bytes
SHA-256: 4c56e8fb892da352683582c38bd18f8c543fa37168219d6e1e0bc2193a2f403a
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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