Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7f8fdffb124b91…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 04:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f33311779f3ab311ffd45a8e169eaea6 SHA-1: a8ed12f1e2a8cef54cfdc9d8f2a748c63ab86739 SHA-256: 5e7f8fdffb124b919ef3b241069f55f5f6bb54ceec5ff08725b0861d4ba13aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting. The primary purpose seems to be directing users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=england+arbitration+act+1996+pdf PDF link annotation
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/933773347700c6984690560866929027/48576406492.pdfIn PDF document text
    • http://veivel.com/userfiles/file/76679367390.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/donavikobemuj.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/14962979163.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8d8562d79c7cdad72b47ab6235f9e479/23915321719.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/92465512746.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26e0ed506---vanomenojijutitaje.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/lalalubanaduf.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/94044020715.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607790429c33b---dudud.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/71682658833.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/tefevutu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7a9da57e38ad3f09f0a7106e9dc76ad0/10338734413.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3b958a4b8---darobemobaneledixavop.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/somoxipozajokarujusem.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lixokapudugi.pdfIn PDF document text
    • http://decorstore.eu/upload/file/sixeme.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/tubipakekoxul.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cadcf00a---jatos.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wakomavazopusavodasuko.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5039fd3300e46a0de0817ff83e804103/tidakuf.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e884328168---fuzabusunivok.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/190347159.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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 18320 bytes
SHA-256: d88b6b16279821d98e263240e64628cf7eb9a4d4b94f8dd01869f2c7d8c071a1
font_01_sfnt_off00012982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 11004 bytes
SHA-256: 22594e18ccb08a3bbd1870dce0ab15568f304c94760ca5d9227c58efce4ea840

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