Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb90eda6115d06…

MALICIOUS

PDF

91.8 KB Created: 2021-08-05 10:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35af77e8c179af32e9fc3a15f2abb442 SHA-1: bf0eeb06034e2ad4f7cf0999eae802486df2bc5e SHA-256: 9dcb90eda6115d063bf1a9bce2597890b15d627c1361ca0db7e05539fe26cd52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/eed7dc1a695b4ca6d5eebf7b26929cff/tusixuzevalezewafuwapaxak.pdf In PDF document text
    • http://deasreunion.com/clients/860224/File/bunomunujozamukukipenin.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/63880801681.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160952a60bff6e---velixakodesodefarafuwiruz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b343275c8---dakuberawepafidoloragipiw.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b090c89ac175bedf173d1f723560015b/27154105572.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a313b680e---66431189426.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/10608173668.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/dujosewobedatu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d5b08dfd0---4211147361.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5302de791089489d34647229ea6b97a2/84071936534.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/86130959977.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829d5d8af2d---fojobonevorozituw.pdfIn PDF document text
    • http://centrons.com/uploaded/file/69314742160c6f145b210c.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bbf26679459e5809832fc98c967b7929/bagajodakowagozamizefilov.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/94764651447.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kulilagusoxuxexobekilo.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/83133627640.pdfIn PDF document text
    • https://webmenuplus.com/images/file/317076843.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80b6ea045---88634915103.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vuird2j9vnnuvnb1hnvgvqieb2/72061594147.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610b3c717805f---42499307554.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/38394679648.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba2d27fc0---zotobalivemipibesadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+write+an+apa+style+literature+reviewPDF 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_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1B 10600 bytes
SHA-256: 449e56ba63364a403f30031774e1089c987f52561044dc79cd7bb2749b25f6e0
font_02_sfnt_off0001347b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347B 16920 bytes
SHA-256: d107cb70f31e3bfdafb85f84d2a8b71637ec7d6c349d4ab93def31c7554b10e8

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