Malicious PDF — malware analysis report

Static analysis result for SHA-256 802bc361cf1e7da5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-14 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d891a5d2193916394715b97aa90576a9 SHA-1: f40930db9ffc2feef857ae36f3b1be44b4e8841e SHA-256: 802bc361cf1e7da5991538a77a9b7b0fa95c1aa9439f2cc2b740cf39f5097c01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a malicious document. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=sindh+driving+license+online+apply PDF link annotation
    • http://metamorfoza-krosno.pl/userfiles/file/42970616922.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/33735642666.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/7195973238.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/ledabivadelexoxixav.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/91044562501.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/54971013834.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zitororuzipibojekazideso.pdfIn PDF document text
    • https://cargotavio.ru/files/file/detowirusojobuzojosu.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/52910270918.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/72039701798.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/54868333508.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec523ebada---divubad.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kurisozodawusabilevenomun.pdfIn PDF document text
    • http://yilip.net/userData/board/file/45464382301.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/2394708961.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/pujelixod.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/76407552472.pdfIn PDF document text
    • http://soles2walk.com/data/file/simivomabamekefifekafe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/31c3ee8b3a7d4ef1aa93606ceef41281/20322894895.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/66a82cd3d8e0728c7eff53147b0c6910/57904893665.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341134b6e75---ravuniwerumatoboledimuki.pdfIn PDF document text
    • http://alptw.com/images/files/gaxux.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nafiz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5334c786---2452664954.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/goponesebipa.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_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10952 bytes
SHA-256: 9c40f595fecbf6a1c9d00e761a31140bd4e9f8d08d3bb8b85a89ba863b204155
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 16328 bytes
SHA-256: 1ec5cd05e5a81a43f8d5c1dad860ce12e954edaf80b5117343c10ff8b443877b