Malicious PDF — malware analysis report

Static analysis result for SHA-256 246a921979e7313a…

MALICIOUS

PDF

96.5 KB Created: 2021-08-23 12:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d86a609ab16ca9ed142e6bf1fe44c896 SHA-1: 16232949829fc490421bbc55f0a78da7d94e8792 SHA-256: 246a921979e7313a23a9aeed26210d3008ae4a9952f93c74c9c9f3a1e29e5a01
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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://catamma.ru/uplcv?utm_term=judge+dolly+gee PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c15639c63a4b8857c2dad4e28882960e/55103281899.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/23591400187.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab070755167.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a24046ec0---72727894100.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7o4i4nfmoopvck27f24hhh6cmh/85046073575.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3f5pd1b0jb3ai6hjmcsfomg5t3/fijanekuzonazufogevirasup.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/00321cadda06f898d6c1b7da3960ebf5/netudidupelo.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/60346641862.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a75a6e88---wuvuduvojefanujinu.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/vavunevufajesa.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/17363606216.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6778b1be48046f31ff97f1a5c6012954/giraj.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/jirefepejidovatifiraw.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/12532469706.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611835ead3f74---86971076130.pdfIn PDF document text
    • http://wami.cc/data/files/xiwesadixemebiguv.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/nevijux.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/tofajagezuwepezisuzik.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/71739909367.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/15329829994.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/54849169857.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bsm98j4lms5c7ljkkcgqfdn3eb/wotimavifetudogefiruf.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d2ed730d2---setarubuwimolivaborivipiw.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/nalamebemisawuxeg.pdfIn PDF document text
    • 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_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 17312 bytes
SHA-256: f818488fd27f7e275cfa185a45dca321d67958a61853d9bf134b833b998218cb
font_01_sfnt_off00014496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14496 9904 bytes
SHA-256: c8bb5d4cf6223795e13bbc6520e9b8fa8dd0220bd0cafe61f435897407c9aff3
font_02_sfnt_off00015a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1