Malicious PDF — malware analysis report

Static analysis result for SHA-256 81413de2c35b994d…

MALICIOUS

PDF

73.3 KB Created: 2021-06-15 22:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f90a0c3f542b09e13027aaba30f86c7c SHA-1: 8860a653aada73621fada75fa940805f321c76c5 SHA-256: 81413de2c35b994df209e899ee9711b96ded64bfc4d2bcb2918df04656dd699c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malware or phishing content. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=gta+san+andreas+cheats+ps2+skinny', are designed to lure users under the guise of providing game cheats, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=gta+san+andreas+cheats+ps2+skinny PDF link annotation
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608629f97f835---61316932478.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160717ebfae6a2---vujuwodalenamimutemim.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a970da9c90c---kaxizotede.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2r8ufhkqhvumuccg9s285k9v30/tupifezobupalu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kokanutileviludaxajuki.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/14/files/48660484794.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6ddcba47ccba539e85e989dea68ead4a/zofexisegoroxajovum.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/1328703506.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160738849c967e---87774836002.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c02b13140---35278768505.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/54765641746.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c88c0dd2b---zaditowa.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/samugaduxalikezilutoze.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/75614136073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5460 bytes
SHA-256: a04189daf27a0ca2f5be5e9589a6727232ff3bcaeb0b6070c3a8e98aabe26b9a
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 10780 bytes
SHA-256: 5212b47564f8eb685b056760e3c7059d783b8f17e1b4b47e99ee4df42f932687

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