Malicious PDF — malware analysis report

Static analysis result for SHA-256 79541898b3f6771a…

MALICIOUS

PDF

76.4 KB Created: 2021-08-30 09:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 383cf78a522dbf39424e12e0c7d6f57f SHA-1: 0151ff301292e1abc98fadb67c3172dfd576a51b SHA-256: 79541898b3f6771a25c7c761334f479d5c8ea634e6cbd1cde178a08bbbee4217
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics indicates an attempt to lead users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.ecvbrass.ch/user/web/file/karigomabovofeduxavep.pdf
    • http://imi.vc/upload/files/romomuzezijanegiza.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hfbn1u0atp9o47a5mml0skqfe3/35551098603.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b447a95ed40403357b8b656935c4f859/kimolegijuzel.pdf
    • http://pcccphucvinh.com/upload/files/mejojexif.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/japodezexabako.pdf
    • https://jjcfurnituremaker.com/userfiles/files/37202903758.pdf
    • https://beauti-full.ru/uploads/files/68734739903.pdf
    • http://goldenpeak.it/userfiles/files/54511826637.pdf
    • https://imaggu.com/ci/userfiles/files/lutobokujoped.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/pepemevuzifilazozezasid.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/102adeaf536a4d557b434f04498a6ad7/fufolixagidar.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a4910ebf35fad77df0946cb3011475fb/92734293297.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f27dca83ae2---84457590100.pdf
    • http://fittbike.hu/files/file/weresuvopawilu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb38826548---52819323055.pdf
    • https://777mto.com/contents//files/jinutakovixafo.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ea72a182d72bc827a6d2b209a36ec03/kegawitonafamasuza.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/73e9d9dada675e5bf1f06c1058d20447/10807562249.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/n2fp113eiumh560a08fpdk0286/62130416006.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+long+do+roaches+live+without+food+or+water
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/94456110252.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f6633ac8c30efe293c863ce5497eeed4/66596095552.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b6.bin
423e13b2de2152891fc80f3702d7d38ec119a6fdbdf827ef93c422f50f5581c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B6 11000 bytes
font_01_sfnt_off0000df0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 16792 bytes
font_02_sfnt_off0000f71c.bin
6222849e7fc63452b51b1774deafb3cc09ab7ae33c19c4a7600844b0ffd50765
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 17228 bytes