Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eb669ee42498b9…

MALICIOUS

PDF

83.5 KB Created: 2021-08-23 17:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc5425a3499ae3ba0dd85dd440de1591 SHA-1: deda131f5bc814cd587a5a92373d72adca6b7f7c SHA-256: 11eb669ee42498b9989e2e623206111c34952f060bfbb60615b7c7e8ec36b332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doktor-ara.com/userfiles/files/87996540674.pdf In PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/281251e94996b7f1f8af42a022f8e7ce/xopokapetosijulevof.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a8843fc77---43671042535.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/pikoleb.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2ee72b43---tinizezajovimukavamub.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/61f71b2e811a79532f087ddf54533913/bodesepagujetunepumokomen.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ba7cs3oj7d9bjec5i6cc0n6fvm/85189828086.pdfIn PDF document text
    • https://ultralloy.net/upload/files/wabigaboriga.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/kibetozenumati.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/beponetulep.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978e3a50274---fevitun.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/felokukivixozu.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/30046727056.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/dabedozijemifiw.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/gowijiriv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fuzogezije.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/bba211d0bcc585a8b9872a1504cdae52/26933714947.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d633a2fb23---86008010652.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd711c4f13---84430611511.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/30491024825.pdfIn PDF document text
    • https://aksusu.com/upload/files/95844143739.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1emqgc7shnas5ah9qn7262b625/94801663155.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/javebawetepelosudevupa.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7c4dc1d121e672e47b9126b8f0b0b23/40451855023.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1c3a67077f639d159cf12248f36a880c/bamivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=highlighter+tool+for+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_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10336 bytes
SHA-256: 103336dce7b85ad3975be0f13799624fdffea2557add53be6bf3471f1a0af406
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 16540 bytes
SHA-256: 08aa34105e9dcc8ebdf39fa8f2dfad9fc753b51b609d65c7494c1a40ba30eba8
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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