Malicious PDF — malware analysis report

Static analysis result for SHA-256 0859ce212d1d05db…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f141c51441ab8c1e7cfca2f3733f5ff8 SHA-1: 2d043c817aef56c83b98c93bd919ec4c2189cacf SHA-256: 0859ce212d1d05db834f2e533873cdc983da52bc0c1427bbaa9536fdc0496320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document's structure as a link farm suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=cassell%27s+dictionary+of+classical+mythology+pdf PDF link annotation
    • http://monkey-do.net/userfiles/file/94510648910.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5aea46f876d52f9c8493a952a948ab6d/kepupewubapub.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/81703764358.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1dc11df2eb15b1ac7da4b82462ebc535/fasutewufavazuliwasawos.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/30acerjd48h91fjair8vudf9oe/68966574986.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/tuqb6gk419bf7veru2nn9oes1l/54074209003.pdfIn PDF document text
    • http://meskerjager.nl/media/files/lobenikaxuzutuluduw.pdfIn PDF document text
    • https://codecs.ro/images/file/takupede.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/kagakilalebud.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/50290675691.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/65015bbfb619393f72e8ed66f18caddc/lemagejeruxopetamepaxodig.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1aa43373---waguta.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/69902303765.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c75d06b5---17345475470.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1fbfb7b43c5f6e492745f7efb20389b3/53043966057.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9aa1bc99---goxoxowexexovurep.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c9e8f0173436f9abe1c9c8d9e19b270/kiduwifulapevavuleguta.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad37b23c304---sinepifixonik.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e3iqmkaf9pjvmifhnfe49btb75/lotekava.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6d9207ef330102e4057715ff47cabbfa/daxarotetusi.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/53910153318.pdfIn PDF document text
    • 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_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 18216 bytes
SHA-256: ba255595f8b90a95af3ef713f8652481fc6217446e60de0bd976d388878dac90
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 11244 bytes
SHA-256: efacf3c7d561b4e65b656552bfc1aa5061ab9415f0badcbc3094aea2f222c600
font_02_sfnt_off00013d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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