Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66ed0f05e0d6531…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4569cf2a5e2cee81022797dc91c6d707 SHA-1: f3b44b742f3b928e5c842ef983e757b12ee29bee SHA-256: e66ed0f05e0d65316a0f1c98a907eaf8e57d0d0e691f64d1531028e476553c53
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a link farm pointing to various PDF files, likely intended to obscure the malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://webvitamin.vn/app/webroot/uploads/files/mukamaropavulofos.pdf In PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/88513440790.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/39738274701.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/49210207416.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/44910345840.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/reselepoviwetifexowe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7df37615---78519823369.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48395792987.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/32874345895.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5fee6b79b---70813356157.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/7023636051.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/64932684910.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/15537429093.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/ninokek.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wuruladutotisizusukivosuz.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/likinagi.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/1738961661.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/86504472832.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/17946320121.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/666d2f0a2ac9fd65f734b315683555a2/83980877156.pdfIn PDF document text
    • http://wernitznigg.at/files/dowudifuxevitegu.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/rifedozegogebutuxuli.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/wororiravuge.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/fevekinanurum.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/nojamekonisewidaj.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///86246014603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+move+contacts+from+phone+to+laptopPDF 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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 10796 bytes
SHA-256: cc57767d68cd8febb6b0cc8edceaa865194a2f263a72138492b1ead71585d366
font_02_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 17812 bytes
SHA-256: 1f24c0f0e8237febc8bbc76ee1e69f0ac1f34e7ffb21a9f6d99ce306e66d7dfe

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