Malicious PDF — malware analysis report

Static analysis result for SHA-256 3673f2cc783c7040…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 16:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 09c1b5512bf1a414603a69a0bbad47bc SHA-1: b7a6ba96b5a58f08c3414be06a62c30f3c7a785a SHA-256: 3673f2cc783c704083ff6fa5bd5307ee4d93e86656b5170667508b88ac1fd7d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/0f3b12013e422a47efcc4c69d12d7260/lemilemamupi.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1bb1b524f2f12f24f45f317834ab4928/xetiwaw.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jogamijum.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/43f76dcf23a8c7653e5701e8376cd056/16884362582.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbaa3c948e---vemezijewafuzib.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tosawaxenexisezisavotevim.pdfIn PDF document text
    • http://katachizu.com/img/news/files/98740579364.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/59990382271.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bb32a977---38806109124.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/femejeduzuvudetumakakoxal.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160900daabe1c5---75117796590.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/43894475211.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/egu30s2q5pks452qjlflbac8h2/9800584121.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/13243950527.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/78407366421.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/imdtrmq53jshpm00trfhoppns0/lumove.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160849426b3e95---31874957633.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/ae1bd5d46d5e16c6c24e47081394574b/kopevikaxuj.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xapup.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/f8h9c2spl8rn2c826bin4o8pd3/20751700816.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zariporopowukikalawonetew.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c9d15c3da506e3943bdf28435967c628/zukotanizufuserelok.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/84351091039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=social+dignity+meaningPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16788 bytes
SHA-256: 077f931ffc161626a351f3bf315483cca5f295a68384d76a82ba736528309a0b
font_01_sfnt_off00011b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 10632 bytes
SHA-256: 15a6f21e37193779bc38adf1407c609e80d6e2882267cf4f789357ce27e90e07

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