Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84412db39628f03…

MALICIOUS

PDF

58.5 KB Created: 2021-06-24 22:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fe1907f4035dcd99fb784dc98a838552 SHA-1: c27bd7a03471cb48a7d65dca48b2e860a0fb412e SHA-256: e84412db39628f0309961a1782662029072eb60b688c3200fdc3bf7ac75fbc26
154 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs that point to potentially compromised websites and file-hosting services. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the document's structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8067

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://infrive.ru/uplcv?utm_term=polyn%25C3%25B4me+du+second+degr%25C3%25A9 PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4095622da61d1184f0e6ae43593e71c9/rofuzex.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/5342774613.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gavasotulubuzebodilojulaw.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078310d4349b---53740824218.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/90313250277.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e44228d7---94763782452.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/5fc2a3f3d12dc1d6b0824fdd3ae47aac/8187937004.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/55152532358.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n6ttj52m8pbco0c20pgpgfrm72/rowovububureboluweto.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i4ctt11fpt7ahj4fc48f4ohegu/badim.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ff32ac72---gufenufojeforuro.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/o0ppbvfjcfrvhfkefrmaj12rvf/53265023740.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/33123244846.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ed0801a71c8a8cbbca62af0534c26e22/71490086013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 5436 bytes
SHA-256: eaabb4112b19a9720e9ca86d96b2087b7b956a853f786ce498a0e0d20a12e5f7

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