Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68cfaa3659d8828…

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 13:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01b30c51d45dbc0e3b851a3c57e78679 SHA-1: e359b3d63b23d0e8fff5f5f13c0a5078f2faab2a SHA-256: c68cfaa3659d8828f12e8843a8cc7f1eff4966ccf803c7d259feef9b87c124cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://heuresromantiques.com/upload/files/visimulojitubomuxa.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/65620b6ea1854a3a327d7844c3221d53/75384237429.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/52344078188.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/97983165000.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e448b2ec099---ninutivewobipexawon.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/razulilojopo.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/55151674390.pdfIn PDF document text
    • https://ckmandarin.com/uploads/zetunivetifizokemop.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/femelogafelupon.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202082977512.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2d4996587---24348581844.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/16437823778.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a0a72a4f---12515800861.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/fotufexunujat.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/10ku27eoq7bjs89n6qju45rae1/wexojukuxarinazipidalil.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/62953329924.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/90868594954.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/22418573760.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d642d128573---zelogezu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dogigezesugunisod.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/kitebexufitimi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/nazijanaribumilorapikejov.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/14460049684.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/jetikimofazuruzabopuxaser.pdfIn PDF document text
    • http://smn69.com/clients/866038/File/tusonazowigolunid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=commentaire+compos%C3%A9+exemple+roman+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 11068 bytes
SHA-256: 4da26a286831edf88a9163499fe13721d080ef55c43ea598480c3773853cd268
font_01_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 20600 bytes
SHA-256: d3122149aa72815d8d68c54d3db5e38dea176fc0847e821e4c96b507aca9df8e
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1