Malicious PDF — malware analysis report

Static analysis result for SHA-256 feac82451a1d0792…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 02:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d7b4b4f1f4e545d0196c723a111e2d SHA-1: cfeb579b6f5187935c72e732114ce2553a967f70 SHA-256: feac82451a1d0792f9251e18a78fe98b5c72abf5fc45e7211bacdfb83b1d4ed0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://avukatwebsitesi.cicasoft.com/upload/files/51210972810.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mufawibunebizumimetazad.pdf
    • https://mimpishio1.com/contents/files/jikatenolanuka.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161490d311053d---12690860505.pdf
    • http://sinners-party.de/media/file/kanisuxi.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/51713268712.pdf
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/fujubufazikesugevad.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f9b83486ee8ae25d8846d91a2ba8b4df/pozewosomokagoxavinepu.pdf
    • http://cantinachitarra.it/userfiles/file/peruvudoxozurijezovane.pdf
    • https://igk-lilienthal.de/downloads/nuxidobar.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zixeroda.pdf
    • http://kk-gorenjska.si/uporabnik/file/xawonefoginajaz.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/57f243bfc6f5bf05bc6ab143bc1b1d99/77831960875.pdf
    • https://andhimazhai.com/images/files/22712852237.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdf
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/60492555737.pdf
    • https://markmont.eu/editor_uploads/system/files/finodenukovexemovag.pdf
    • http://www.primariasantana.ro/uploads/file/xerunuseduzabose.pdf
    • http://moskvaznaet.ru/upload/files/jelukojudomu.pdf
    • http://cyclad.org/UserFiles/file/87674550289.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+2019+app+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0f.bin
da571306a2babc8004546fc796119db3924fa211f03526921710809df758804a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0F 17820 bytes
font_01_sfnt_off00010bae.bin
fa4a9f09fd6e420a910f2725e1e06d4e9ba045b7e14a504e99b9ba266b26f47e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 10804 bytes
font_02_sfnt_off000124a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 16792 bytes

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