Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c95e8468a09966…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 15:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8766ec8fe5402c4b3832db2d29038a22 SHA-1: f3e7e25b8234d8e12232f7ea691951b138ca4e60 SHA-256: c5c95e8468a0996687b28aa979ffc3508d18c87468e6eb8184f830c0f160e4c2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2255

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://catamma.ru/uplcv?utm_term=hbr+guide+to+office+politics+pdf+free+download PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abf46f150b1---88259965778.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e1cjlnkr6cgm398qepg8e2vn70/wezazanozemokejisiwaji.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/fomurotum.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b658b302a---renenukimu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0664f8db---11071747740.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/levivoraxivolapifuxop.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/239d59f881ff53032c8f1f949c423cd6/46911139549.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8097331466---15812750972.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077081ac5f98---fawumijolitajenajose.pdfIn PDF document text
    • http://benly-carson.com/product/files/revajozib.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/26647016313.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/jajajomom.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a317f63016f---22002129528.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/vusumuxibumino.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nupobubitifakonura.pdfIn PDF document text
    • http://01host.ru/userfiles/files/21474706690.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/991778b55e8eab6bf4f969298065b1e8/53689542876.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210616_8389264086031929.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5ba05rp07iuvds2fi89i1eidel/banesub.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/93331067784.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/72177469964.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147c786d324---fixawegofikofuwurugu.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/64196527912.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/932a7d5638e0c91b135c5b6fbc742be4/vedexowito.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/64193032332.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-9/20210609185715639752.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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 11112 bytes
SHA-256: 8e3d2ff3c1bed3ca96a5fbfd3f77c90aaeb24dc5152cd429398b7ab04fc624e0