Malicious PDF — malware analysis report

Static analysis result for SHA-256 18fa1193a1a1f13a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 07:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbebc7b6603f07790820fda56523e748 SHA-1: 28c3d0c2cd5340401356c74e7b7daabe810675f8 SHA-256: 18fa1193a1a1f13a6972e5ac68ba91931d5d4bd25325752ccaf79068247b965c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress upload storage. The primary attack pattern appears to be directing users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=analytical+ability+questions+pdf PDF link annotation
    • http://keralastatetailorsassociation.com/userfiles/file/20172415587.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/fedawovoxamasazigi.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210803_7D2DDCC82B497E0A.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/pasuvaguw.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/nirebufubufidaxoj.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/27029235574.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb3e15ceb---ponelow.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/0e7hhre2l7tbdhndhbj540m6bl/refopavefav.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/rosajotad.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160884f3fca7f0---vekutetonereronekatu.pdfIn PDF document text
    • http://www.toptehnik.si/images/4376147089.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kewubesefidopogef.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pezuxuviv.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vazutepalamiraranafulok.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/tebasufe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/mefatobubixigiroxun.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b455aa0a4---nimitafekemo.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zotet.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/38dde06705c61a3af751f086eec18622/jogapow.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vp57ipuv906ffe1vgump2oh9u5/85824165456.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fshant5n4dd98t3o7hsnl3d1j5/tiwexulumidivumesuvamifak.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/1790230995.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_off0000b68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68D 10992 bytes
SHA-256: 5a73a4745f9b948720264f7d11130fbb32203d9f3be2ad3db0970f1627e98c5d
font_01_sfnt_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 14896 bytes
SHA-256: 81cbde64e368731a0a37d8fb3580e3854f169fde67c3b1bd0c37094303bd226e
font_02_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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