Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6263c4e394bafd4…

MALICIOUS

PDF

87.1 KB Created: 2021-06-29 20:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afc3854e377d9e814729514eb2fd95ca SHA-1: 97e2feda48628b794121399993503cfbbb178ee5 SHA-256: b6263c4e394bafd45611bd36c8dfcbaa4dc9b8b77b78930f3823b510680fb2fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=another+name+for+free+enterprise+system PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7c84ae238c1fc43a00248f7f0cd52a39/84643111354.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7dec532fe11ce0b167e090b2164d877e/91400413205.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160861ee96cac4---gezebizazifuzigu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l8moght9vvgm0o7s9crvjuua6f/vikofanuzomin.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb710d1e7f---16079018175.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/32372156983.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/98851406126.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa13ff2817---dobobobupevabaguxelimuw.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/nizeveze.pdfIn PDF document text
    • http://irths.com/upload_files/files/jomowiwupefebumawezibi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/2a125a001a46bf0bd04aa287aad11f07/gizimimudis.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/39717749065.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1ff4b0a17e23177bfd70dfe600dc362b/94523051897.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/31965554942.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/90721055247.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096638245eec---barurisanadexubiro.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/93861517621.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/kivatawu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/26274580997.pdfIn PDF document text
    • https://sy-tech.eu/file/18980439134.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074900dc1da8---86014439287.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc13d06df8---sigimaba.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a1739f740a3787f0031944cb55537076/20957574373.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10672 bytes
SHA-256: 7af432b5907ec3cb8594954eda3ccf847626a294324859df22a29dfd4ff9a64c
font_01_sfnt_off00010b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8B 16728 bytes
SHA-256: e7c434d47a802b3c2e8686ec76e7f58f94573380a10b23d342621a3b4caa6048
font_02_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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