Malicious PDF — malware analysis report

Static analysis result for SHA-256 41541790ddf62875…

MALICIOUS

PDF

63.7 KB Created: 2021-05-14 20:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3513e7181126c0d400e5e895a2e1028 SHA-1: 0fda82723ee9aa73bc0f7e61bf0953d4b6356e9b SHA-256: 41541790ddf62875ee2e7ab23d942d40d01804816748bcc1c9f5ecc9ac92557e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8425

Heuristics 5

  • 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
  • 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=garrapata+boophilus+microplus+pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/51c90b9c972db1513a8b1175a30d8daa/25850236142.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6d56f4b3.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608086338f62e---96954127706.pdf
    • http://alexhofford.com/temp/files/file/49854077489.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ce0bd51f---fiwazaxexakadezijiguvajif.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/8e43797b7d2998a85b97b9058c25232f/56987633611.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b4f3c8a7---kitimufan.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e248636ef5399b2a040d9284a4492667/77913401187.pdf
    • http://ankamet.com/userfiles/file/katokuto.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/abde3401c0790c543634f2598d1f2189/fomozewonipapakuli.pdf
    • https://zlatartopalovic.rs//files/vufabexanujoga.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/1703c633cf660655ba3e3642ccd6a4f4/mipusinuxuvapines.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rv1hgh2sk1inj1janu1u2u444b/31182424432.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/561734b82cfc4c3b4ce134ffb6c70a80/49457644064.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6991c25453273029a58d543c58224625/57583541613.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7855935c9d129dac96017ba07ead07a3/39600717387.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0a.bin
701a36c4f3e83a7199dd41b59b2683205387358afd3a1f9376e7b1c61c91bf52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 5564 bytes

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