Malicious PDF — malware analysis report

Static analysis result for SHA-256 6944621b4cd4c463…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 14:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 107ba9ef087bdf1f520b9246035e62b5 SHA-1: a99f10d54f4eef5d88c0cdbdaec4becb34b18270 SHA-256: 6944621b4cd4c46399d7a2338f3de3d6ce20850e8907b7a573b46b5ad6022bf7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The file's structure and content suggest it's designed to lure users into clicking links that may lead to further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/14287904935.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8c8484a09438919b50ff54b73a875ce9/97371291872.pdfIn PDF document text
    • http://hotechike.com/files/files/76294467730.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/34542352407.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132e67f5cf06---38710135068.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/sozanu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/zejaboposuwugor.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/puxexezik.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/fefinagivapudidosipa.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161335f4b1f4d3---falewowogonebunoxa.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/4253091780.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/kenoguvinoxerudewudu.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210908024816_1520407368.pdfIn PDF document text
    • http://poorclarescork.ie/images/zakalorutigufode.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/xoropunibananobetizasebop.pdfIn PDF document text
    • http://videlec.be/ressource/file/36981159618.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911182412770964.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109050201505642.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c042e360d1---71264010645.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afae6969ce---99862417321.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/17906876706.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/9538186984.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/tojazis.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/18055733015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+stock+launcher+for+androidPDF link annotation
    • 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_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 10820 bytes
SHA-256: d1b4669b2feb8fef4f94cae93311b4bc3519a81351447135ae6a8fadbbc4c471
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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