Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfcffbcbac02096…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 10:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bb14855fce55c7c333cca5d6e6ff139 SHA-1: 084f8ae03c60d4dfbb386006e6554b2015d895ad SHA-256: 5dfcffbcbac02096a76d5577110e0afb2ca0a45936d5ea29750125dba676ed08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to obscure the true destination. The presence of embedded JavaScript further supports its malicious nature, likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/88ea40c24adc306cfe6fd1de79f1fa11/kufotazereba.pdf In PDF document text
    • http://immobilieninvestors.eu/userfiles/file/rekaxitexadexe.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/74431403890.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/39943404318.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/zasevorojegitoxidu.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/93ff49f1abfe46fe8c11787a2f32076d/33062869694.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q7d0tjr4ql3fg5s90u20cfmb05/22013371325.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/nudaziju.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160987b2122809---68836855160.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/98297868250.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88e48ea5e---jufezexirukub.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/93077938599.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/femunidaxizagiverez.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6bab61e34---9548946585.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/sukadutijezurodefuzebi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9c1ccbb9---donabobavigubatamaj.pdfIn PDF document text
    • https://airbays.com/userfiles/file/68715056332.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/4dc453438666d659b684482b067dc344/tufabep.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9e6d76d7---29836666052.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/24e4a1c7da6996853c56edce7d2c4b2f/lujitedo.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/famevezog.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/tijabusefizijexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=project+management+standard+operating+proceduresPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16924 bytes
SHA-256: 3efebc795444fe47e0663f408afd026bd7b991358c77f42229b68a19f84657fd
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 11044 bytes
SHA-256: 84cc62424309c1b369ea91552932ceb5e59efee6149ba8be55a5b82791d32c7d

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