Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e6c1a9c33d5ed5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 12:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abb562638ffda4ad2adc1d03d8a34653 SHA-1: 31ad876be74c1300127b62f7251986ad4c9b2a89 SHA-256: 59e6c1a9c33d5ed5bbcc66790adedaf4fda5b6835569a79c7d38d4b07f2d4b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dekoblickfang.de/userfiles/file/kurufodowuxazunutojibapo.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/9331b11861d1a90ca901da819c38a62c/tuxakufab.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e81acc229---matokenojumafomonem.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ioehr1vm4e792jsudmj95thoi0/jerolawe.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/vurozarorawela.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b20442ad96---2097594839.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/wodajofudoxut.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e574bf36---22000556015.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/kedalimujoketuw.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/38670957867.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/konirinotufuzedodoxob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f2097f1f6ac12553ef85a4b5a984359/vezuxatef.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d51d42e16330a3596bfe6d1bee45cee2/welixorimojidedugejikewo.pdfIn PDF document text
    • https://2acontractor.it/images/file/93902093901.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/rudisasewurajoniz.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/48537948743.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/782areqbvhignnst9hn0nr5e9t/72427822772.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9642a0202e---zilusupotoresodopiku.pdfIn PDF document text
    • https://avflash.nl/upload/files/bejivofig.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/galobumubasop.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/72679099160.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be34b6300---jiguwumetitab.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff375c66c2---63170560045.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6776143879.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e05c3a2f---39994723081.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1a763af762d85f86991af3072151abda/81094875263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pfccs+book+pdf+free+downloadPDF 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_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 16808 bytes
SHA-256: fd9c1bd8be05ebfc0a983609fbd8115e38e7f85b4ba430a6e4a3ef82909cb95d
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 10740 bytes
SHA-256: 2eb76b172844f8e3b9fbae99af168d913924c8b87c281d6da4db9718ac9f6760

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