Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebcbe29068aa033…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 18:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: beee36693fb8c1cc88c5bdcf4b207b2f SHA-1: 3eb32d0ae0fadeb48d13463950d22dda7e48220f SHA-256: 1ebcbe29068aa03357b01cced805cf49d6984a707647628b2b5d0d053d78cf33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage SEO and compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sherwoodchambergolf.org/ckfinder/userfiles/files/79636186017.pdf In PDF document text
    • http://cappellastudio.it/userfiles/files/10567530838.pdfIn PDF document text
    • https://unitjaya.com/contents//files/minesivurapi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/0mcq93tjfbkubmo4bhbocl7m2h/vedobaketor.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/hhbo95ghbh9qo2d928fh0oerh5/piviboxis.pdfIn PDF document text
    • https://carlojans.com/cms/file/ponoriminatina.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jodozataradijoxeve.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/vezezubufodagexuxeluzoxu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e3e3cb84942efda61e580e237c511858/poximebifokuwiboda.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/wozazavazewo.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/tilotazunatolapino.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8gqfbi7hu4g33cmerikiqst635/ropanafomum.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh9igqa1ffr5sk9se6g2561fr7/vazatofase.pdfIn PDF document text
    • https://tantecoccole016.it/file/pabeligig.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/mifuzowev.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/43489504687.pdfIn PDF document text
    • http://foodchemsino.com/d/files/xakowofoman.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/zoxigotimirubapixo.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23398335509.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/vowuvoson.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27a9409f16---58995773151.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/nixozujupevalesulenu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/56488625065.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/letigitego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=intolerancia+a+la+lactosa+pdf+2019PDF 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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 16584 bytes
SHA-256: a774e5f41944ce41ed588befeb1b720f3ce6a99ed5cf3584d12cf6b0da681f5d
font_01_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 11028 bytes
SHA-256: 7128378f5b9e70476cbc23d4dec61fe222471e736a72e1645b542b16b6f1ee84
font_02_sfnt_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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