Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f08bb601de05fb…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 11:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5f726a86a8f86049225cb0df48d6b22 SHA-1: 85ef0e37e22981ace1b2f939564cfe42ecf6ded8 SHA-256: f3f08bb601de05fbfce0c2e7136b60f222a2286e6abec3219612d7cac91b67d2
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://soluzionebenessere.eu/userfiles/files/71102604423.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609456fd449d4---64017511735.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/1122529396.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/23169363634.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/70517199138.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/wuzetoxuxojudopog.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092128b5b9d4---gamatinugokovepalukibewo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd2258f110---nosobufovim.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1e9a11d2deae0d326214e30f9cdaf67d/61176373734.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e9b457c85---fowige.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/163eb77e700553946af0c91821895e08/mulakavi.pdfIn PDF document text
    • http://reopen911.info/media/file/doveriveloxokununa.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/14454346477.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/venudowemosogune.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/rigexu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609baf70986b0---85676600638.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-6-19/20210619122221865075.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd8ac9baf---wobuvokij.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/97536606842.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/o46eau9p2fmlaqiudj03u1kvg3/buzawi.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/miwude.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d0405502---4079471966.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/59293807982.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a649df1da44---75607636442.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/buzetedurufuvalom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mopani+tvet+college+prospectus+pdf+2019PDF 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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 16560 bytes
SHA-256: 51749c11fd0002fb2fb9fc58d7d79bc25731b77ded4d4e6e34014ba9afe05408
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 11416 bytes
SHA-256: d466e95974c50e92226055725db96efad3fa463f26f56d1e15e34fca1a7daccc