Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da7ede04ee72489…

MALICIOUS

PDF

71.9 KB Created: 2021-07-21 07:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5db21bed8f7eb885be6d53368f37a554 SHA-1: 0cfd31518ac3475f85c5b01a676b78d57f9f8b38 SHA-256: 4da7ede04ee72489fef64cb2a5825a8fa004f0240aba5781bf74bb461cd172bc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://blackivy.pl/userfiles/file/gopunedodiludesenexuxo.pdf In PDF document text
    • http://uniquecharacters.com/upload/files/42104715419.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a869685e386---xisamowatemuxetabujeder.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xogetino.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5efa61ec3755be9862b7a89e78bb9642/jekemezezoremedegomagofi.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/82964488890.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d38646a7b5---xubawag.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/487h85fiaojs1dr42r3nlr3ib0/79423236845.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8mq9pn79rdpust1qege8fvshli/88081685669.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a0rkiqd5qjc2gr8n2ns7e14ofc/87960515548.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/rud4bb56k07ei425rsaoubgbd6/mutujoripe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6b686f662---sivabivuteri.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bemalinixoradim.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6d9ce249c4312d7967f321c647bd0fa8/bejazobu.pdfIn PDF document text
    • http://vtaky.sk/media/file/16443313552.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/xomug.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/mifodezetorafoluzo.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/85600893040.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/28173883287.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ac9bb051b79b496e2d267547d2feedab/bebesuvokomamububutik.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/20a1nue52psov0nlksf2oe3e67/rawasufonumunojugunuvelel.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/72077162302.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r487fgp1kobmf3uaikuoo16qgr/89471156365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=marking+scheme+for+o+level+accountingPDF link annotation
    • 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_off0000b676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 15724 bytes
SHA-256: f3a50882d6b3db521a04fa144f95f81766e61d0068181fc64ef37bd4ca606acd
font_02_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 11036 bytes
SHA-256: a2a4ccc16d157b21a49b50718f12836c3fb60d3c040b33a2946f1913a13e7f14