Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fefdd584bcc98ac…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 11:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bdf3e0a1a2e99b65f545ba4658b424a SHA-1: f2461919c89985b5c2d090bb757d005059f5746c SHA-256: 7fefdd584bcc98ac66e9715b0935d2fdbf2d3b5ebd31f9d2abc1d7da9e975fb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code, likely to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=amniotic+fluid+composition+pdf PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n6ivqdh3db03tqp9mcao93rvk6/mavaropepikafud.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/53086310310.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fadovurevifexi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62f06631f8---6127121050.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jafefemaxa.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4b4179f096a07e55af7fa7f86c4def84/gozizetesi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085119e1c6e6---pojipufurexufibuzepitib.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/29d0ed83c4f78eced25395eed8247b6a/31859148967.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/lixovemomazose.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/73261315786.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/49386066776.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/c5i83ho1ag90ljtp6hlsu01rqf/jopajopefewegapev.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mebadotafak.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2e3d17523d1df66a2ea6cf4f629445b7/povojobegazivuse.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/fodukuta.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/73270455307.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8b777db3---sejewuw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a91fc562c---ropuzaboza.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086639711279---zeveg.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/66664255583.pdfIn PDF document text
    • https://2winit.com/Files/files/88767155374.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9e6b3f0f359089532d416f7245387049/35356947272.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/jugarexosumukajabozozetej.pdfIn PDF document text
    • http://suurelepa.ee/data/file/bafomumotuzutemekajabitaz.pdfIn PDF document text
    • 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_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10468 bytes
SHA-256: 0a6f4e0f50ffee40c238e7adc10855bb5134b88c8d0a6239d0930f5c32a7cdba
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 18388 bytes
SHA-256: f6d138997babf57cc3f3c26ed3569966072a99fdb65cd02b675cb889aa7a9f77

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