Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf58f5603ceb668…

MALICIOUS

PDF

86.0 KB Created: 2021-08-10 04:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ccd2079b3634e906959bf4fff2f3813 SHA-1: 99f188a8d7c48fd8814cd20dc600944df2ef5494 SHA-256: dbf58f5603ceb668844af1ad7ab50b2253b8a9c2936fb7c8181c551801402ede
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. The embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.synagoge-stommeln.de/ckfinder/userfiles/files/nifokukovumuposo.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b21dc3eec---37289408566.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sokenu.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/kogafinixubusub.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/5560362943.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d63f7947ad1---tazewexesadedesinefe.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/vixorirawog.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93c1c3ef8---fegokonuro.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422327660f---95391735306.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fapasir.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/18019098242.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b9cfe613a---widagesaze.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/tozatutinuxugigese.pdfIn PDF document text
    • https://alutat.com/data/file/fewaximukosozudisufiwan.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/fekoworilesidoruse.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/jugonegugezafafu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b9e507f3a74---voraluxamabisa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f2028716---99378939501.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/15809558438.pdfIn PDF document text
    • https://ebooksweb.net/files/file/54630232792.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/85675273006.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cn3cvjq8q8nqcbp9v1tt2blmh3/51292774608.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/79211614871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=voltage+drop+calculator+dcPDF 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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10396 bytes
SHA-256: f3985b1befb542764f77addba08ec83e1ceb3d6254e15d9ad481d370d1319f48
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16840 bytes
SHA-256: 8c6ecd26494383bb949dffaf400c3039f01799c3000c0a84c019eb72690d71e9