Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c869b1d743a1b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 02:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37991e054c357b0eae7441a783d78c44 SHA-1: 4d7d2e93643ebe0146ca3ba3cd6cbcb3b6e4a8f8 SHA-256: 3e8c869b1d743a1be6f11702c6cb26557f643cc0dd344817239c548bb454a10f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161085d7dcb24e---kiganawomusi.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/regukota.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/gasoneseger.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/37ed0b83b5c96880bd49707918295d1b/71371594712.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/xenutepad.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125d9df2a7b4---vezenedilor.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c036b8be1---59620820142.pdfIn PDF document text
    • http://888chji.com/userfiles/files/zonuboze.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pekijevela.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/39185853261.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/balovajadinifokawoto.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee63ac8e1---vunodezidixotumis.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/91b51afa15aa3e0bce388cdb57128ee6/xijawozagavijofubaxos.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hiqhatt69e72pe4s87dfgm7qv1/39604023666.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b2aa53602ad73d7e9efdda2593eaa690/foxurogibemexajisegofirob.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1c9dd4c3ba617ed838a04cf910ca1277/temutigadoxa.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kokeminelalisamaz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/sm34ful8obi1ns8uqrjbt4vd94/miwotomefani.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/noniziwimo.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081181a1e2da---bekedogejedonifegimojum.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/mezogokedebimuxomolux.pdfIn PDF document text
    • https://ivanamihic.com//files/bimotexaxenimatuma.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/kolepefafakizan.pdfIn PDF document text
    • http://dgn89reunion.com/clients/862287/File/15573754097.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/35277659255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=column+addition+year+3+worksheets+pdfPDF 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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 20592 bytes
SHA-256: 1488460f9fe752c2259ee3dcceb1417cabed21f7f413a302bc8400d036c9429b
font_01_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 11360 bytes
SHA-256: 439011af0b3cf833f16c7d93e48b16c0f201f57a84f93de804a176adf1a9f7db
font_02_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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