Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c90a6f5c747c13…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 08:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 029b7baf003aa1b9c0f1948626c42f9c SHA-1: 8f49abb0f3edac7e72aa89b8b3b8c5036d61da1e SHA-256: d8c90a6f5c747c1381d7eef9a3998f4e1b68d3d860b71b15bcdf2afcdad1f65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these are likely part of a link farm designed to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7763628f60e0a8374c24727f11187ce8/49668393841.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160721d5644e04---pezemavupimovu.pdf
    • https://armagedonspedycja.pl/files/file/10439604956.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa813299105---kawepajezeduxo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cf633b18e9556788c661ebe09a132785/jilodazonerurekunomiler.pdf
    • http://bensonlandscape.com/editorData/file/logewopapojetus.pdf
    • http://www.aqsclimited.com/EditorImages/file/ranifebulegotamudabovap.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/62922776302.pdf
    • https://ilmercatinosottocasa.com/file/8469886349.pdf
    • https://info-jimukyoku.jp/lot/upload/files/xalozota.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607119e3c53f7---9801675627.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/98440119951.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072990f4f988---notusenugoji.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/javunefixotaguwimetobalor.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af69c024b32---3552517915.pdf
    • http://assushop.com/userfiles/assushop.com/file/74849571176.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852070c7838---wexuzoninoworav.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2cnaghme3uf18mudfe1chejdia/88907135828.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca752b77---64894143415.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2f276dd3a85a330c2c336771f734083b/78359913514.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da909a82c0---18248950017.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ea93a002a---menojiduvebosebunedarebol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gnats+in+toilet+bowl
    • 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_off0000f2cc.bin
4a57d6ec7c23871a45029a8e9863ccdeb8366a2d362de48b0b85bbb6da0a8c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 10264 bytes
font_01_sfnt_off00010a1c.bin
43c66c5aa11c3f9e8e744fdc7e3fd5a7138f7240aad2355fb9d1460bab10e23d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 17172 bytes
font_02_sfnt_off00013710.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 16792 bytes