Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bef079409448060…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 13:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4b9cfe4b411b05b77f3a8bbdf28d9e7 SHA-1: 4b3ae017db1a94f72721801471d7dca331738509 SHA-256: 7bef0794094480606b0e88a1594282f378c815a4d58ebeac4edeff33a8ecc9b6
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 distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=online+converter+pdf+in+ppt PDF link annotation
    • http://megat.pl/uploaded/fck_files/file/weravegazununufi.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/faledorerubejuxirixidudom.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609764d40d574---gewukuzivitobanu.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/926977629.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161106238d6384---94819907226.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/lubudokadifavo.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/95454587414.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/8f01ca.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722339dca5b---xadonon.pdfIn PDF document text
    • https://togeltop.net/contents//files/62343718837.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210823_145051_4874.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a00ae8fbb5449c580c671e45c6d9583d/giloxipa.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/83707735052.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8998e363d---vavunu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca41aabcda---vobibewipusilurum.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/4oo9eeh9fe2e4g11t041eckr91/wijufar.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/jekozubozuxogexag.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ab4a5960---taxonozoto.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/91994522782.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1f8ee2fe5acf7b746596a2eda92b8f56/72414785648.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/rasosuloxala.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/65612471740.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffefcc9eb---fobigaz.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/6c2cf4a710a9054944862f77d6528151/dawosubutaxagexal.pdfIn PDF document text
    • http://cichanski.com/Upload/file/54281810420.pdfIn 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://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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 16908 bytes
SHA-256: c01ae96e7764b76cb4f53c4818879e0c8f49040e01632d78bca96da3ec202306
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10372 bytes
SHA-256: 170d20997ccbb1d2d37cba35ad8974f70cc726cd03b1b2016c628013464ab77c

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