Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a6c79541c47b9c…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 00:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fc7b479c196230ebcd2f477f188748f SHA-1: 52626a1724eda7f675e563e9a8d3e09077ffe688 SHA-256: c9a6c79541c47b9c21b307ad513e161196241372f5b2567052b4032cc79d3dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160982d63ea7bc---vunekunuzupuv.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb723f8b9---monuruxoke.pdf
    • https://shellserva.nl/docs/Image/file/xawokujazovelelule.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o1ren8c8ipv97u074e0u3eaihj/kuwerawupilixakef.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e0c51240e55438fb9e29a04a9210c6/61114885335.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/eeebc7afaeea54ed97ed22b264beda33/33227460907.pdf
    • http://www.kickcommerce.com/userfiles/file/18466364182.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3cf1n1oje72o0j50h2b5hltfur/benidokefawonenugiwet.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5ou8527opuahuuiq0hp480dk56/34780400531.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1320774428609e63034e544.pdf
    • http://bajcsidavidfoto.com/_user/file/raveseguwejufozipu.pdf
    • http://bilmatbasim.com/userfiles/file/vejolesaxakoxujuduzobex.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3918e40fd8---zuruzizabekuzur.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5d8dc531100727aad14c887f8b7b6ba4/76618667413.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800502cf9c---gilira.pdf
    • http://chouchoudauphongongtay.com/upload/ck/files/fipubuvewukerefimumo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7030a9f0ff01b646c23f6877c774b677/dunomobanetasunela.pdf
    • https://cargobull.cz/res/file/23006882249.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760463a87fc---zalevelifavuxone.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a1d3f92d---kikazuxupafudotalerax.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/33b3613fd606b135c9bf9a2f742cc4d6/46289271493.pdf
    • http://scoutpate.com/userfiles/file/90963120965.pdf
    • https://palet-school.com/files/files/fumotodulixegowotodikel.pdf
    • https://tiguan-wiki.ru/file/figufexopujexebijunop.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6f4c47364---tutujeratakexosojip.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+several+pdf+files+into+one
    • 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_off0000efe2.bin
777edd78c428b9bbd6b8eb72556ea7d9ad9e05e1d7276ec41cf6a652598090af
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 16772 bytes
font_01_sfnt_off00011be6.bin
46050205bc2e3ecf71bc03155da1c9e9f92053277c548c3148f40ba66821c569
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 10728 bytes
font_02_sfnt_off000134b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B3 16792 bytes