Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a65b6aab04bbdea…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 15:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0bcaa607ec46d84ca99a36d610645f17 SHA-1: 6332f4c78cb21e864595ef6cb78f3a2b0cb5ce08 SHA-256: 3a65b6aab04bbdea3567f172c46de1c35720701db59ef28c7095ca2b9416ac94
126 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on what appear to be compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution intent. The file's structure and the nature of the linked content indicate it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3286

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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/8ed18ab3e694cabe3278463790c36709/49398592344.pdf In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/wubejofip.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/funerewomuj.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/munabigezu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zanaxugir.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/jikulerexolawuzimalefi.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210805211145.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce459e2f2---niwopujedasudav.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd30d534c5---fekewazulowagadevikizesa.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mte5fp5hu6ce80r41adottim34/25249429757.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bufedoliwazatuxip.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03e159e05---memizaworawarud.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d8bb5c289048e4a8e1bd953f39ae326d/21993756983.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/denukukamuvulobim.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/02ob07hcir46lp17138100ggh6/58232762709.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/wegetozolatafosubofip.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zulexebapa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40de0c82be---91431254974.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160811cb72a017---72675986260.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161007e04caa9b---64690013460.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/xigasomolisitojudawuzojad.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961a5689f2f---limawunolodudisi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/224dda1808d4d69c2c64327946c78431/61086423657.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fixobavoziturupenisawup.pdfIn PDF document text
    • http://hncastlecable.com/d/files/sejamorosifurok.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3b0faa73bc3086b5962688262b4aeec7/dipimoxil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=with+in+sign+languagePDF link annotation
    • 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_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10260 bytes
SHA-256: 06d2d8d748ae741c6e6a8e3263923b6f0ba67f246c260b0e59e3453f1559d3bb
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 17788 bytes
SHA-256: f08d1d198e8637d352d350c79dc96c528cf43b82b5ea3336b130847cfba82137
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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