Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e8a26a535769fa…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 20:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf57229c0b1628e249b36581edef2db3 SHA-1: 2beedce786eee48cf7c95698728d364cd6d24c1a SHA-256: 92e8a26a535769fa54b84621077ee89ee9c5bce5bdda01353b3b1b31eabe0636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6ebc8938---29030394625.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/nowelisidisifegat.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/47800390613.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210810192111.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/48a52a48531bd1b796d76a3579fccc39/batexejuravijubugukew.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/c55e0ddf59f231e4353ab4af7e45089f/84341039642.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d97e5af0---21769695632.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/13600177063.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1342e1b4---64381044344.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/28852760657.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/78201061791.pdfIn PDF document text
    • https://aspirans.com/files/file/wexalumo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/dananuradeweporefef.pdfIn PDF document text
    • http://labonscafe.com/userfiles/numefisuvol.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6167d85---87715887266.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf73571ef0---8558767551.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/kojofuv.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/sepesepejexunipegifexob.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cf2be9f52219943f6a6a51f570f6502b/wosijened.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/76068277634.pdfIn PDF document text
    • http://bastola.org/userfiles/file/48844290432.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wetemagamotemexaresep.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/32574487095.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/36073026033.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c85fb234d---42128535667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mcq+on+dpsp+pdfPDF 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 23196 bytes
SHA-256: faa721d463b3daae511a8f943de5bc539088fcf0c7fc29fe4b1d5da85d6c3c13
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 10120 bytes
SHA-256: e26d85e5c8ff2f25f9e5a7788acca6c3ca6acbd733fbeffddd49e2119612ff9b

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