Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c02602d0e988e38…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d074d650b763c406761948e3c69dbf6 SHA-1: 1a806dc6fb944e00d9cf02323c456b72cbbf5c90 SHA-256: 5c02602d0e988e38048680011e60afbc41c7c018299e2322632aa3722bc8ad19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple link farms and the use of 'utm_term' parameters suggest an attempt to lure users with search engine optimization tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://astro2sphere.com/admin/images/file/63171156177.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/9254542438.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc11dd6098---13894968146.pdfIn PDF document text
    • http://scsytech.com/upload/files/keferup.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/72824777500.pdfIn PDF document text
    • https://badoza.net/userfiles/file/48155205480.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/vodelale.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kk2a9n2lh6p4qepakn8te8ggrt/60564502037.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610efe7a481c8---21675550366.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/84767920329.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/lemajebudelefobexopu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/628abf683cb1d18479ddcd34c4acbd84/xuneliror.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/80d719b7c6023cc27e0710fe966425d5/jabexugitokofugikumem.pdfIn PDF document text
    • https://matratva.in/userfiles/file/logijolupenedidu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2qtbdgp8jlmrkqq02mslmg2ran/xonuvokojajexisa.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/afd3159e4214a5ac5290d6cbab29e1b4/84443470028.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/lesawitomigomamufixedir.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/58e2fabaa94e48aba41439c537745e19/xipevokefodaxata.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/13d97b50e17bfdfefe9a8c732807fb75/10941811786.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/38533316944.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/74327043259.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608069e7aaae2---5775306364.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/jenerid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=building+contractor+agreement+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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 10948 bytes
SHA-256: 993aaa30943225adbb9c5d566a9c0ef5de565066be4030c4e08307f02e38c8e1
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 17224 bytes
SHA-256: 2e3e74ae0d3a98755bb9e5699ba0815e9b964f89163f1249910bb26c9368b5a2
font_02_sfnt_off00012455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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