Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6ad95dd80941fa…

MALICIOUS

PDF

173.1 KB Created: 2021-06-27 12:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f09692390fd5cdd8c7ccc189f659222e SHA-1: 814c93ffb09a6b91eecf7fee35ace3908f5dda56 SHA-256: 8d6ad95dd80941fa5fb8dc613aa2d04a110cbd9e7347c0bd5cf13b78f04b505d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging T1566.001 (Spearphishing Attachment) for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://synerhu.ru/uplcv?utm_term=signs+of+stridor PDF link annotation
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2d574ecf906ef52208adca7ddb9f2509/pasogedaju.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/haa4tuf9ldfjsia6tjhc4dpoc5/bivovu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/61502963687.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/au55hg0oov4lk82nggsblba4q0/31508928632.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/919b5dfb84821f22fe0829351d1e5fd9/52630298372.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nusukirabelo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763320c4d3e---140463762.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a1d9af9b8---pinuped.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sofuz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607694b3076ee---12236666505.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/39783043076.pdfIn PDF document text
    • http://aweibel.com/Photo/file/17893742900.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a3fd9dd0---fodemibodapikise.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/xolebixakogupizog.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/lisedukojatapabax.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/60030839546.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d68b310e15---62676184580.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f8552801518ba6f2d1f864dd0f5ad7ea/safenevixolo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2902d0f4b7---xepitasagodikaxavudem.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/7ded129973b8dc1e9f54dabe4128c4e0/18062691967.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/taluluduxeramumone.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/1771786989.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b15bba08c9d720aafba09e77aba37068/sedumowemo.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_off0002476f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2476F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F86 10264 bytes
SHA-256: b6ddda1680786792c951d58748ee1dc3f75a3fa092abc6e245e629720b576747
font_02_sfnt_off0002766f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2766F 18460 bytes
SHA-256: b394d7a69c6b40054f139e68c5fbba14743e41957d499e60a7300755abb4b237

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