Malicious PDF — malware analysis report

Static analysis result for SHA-256 137658d182f62038…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 06:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82c505e7e317e8a83d2503f11cc7e21a SHA-1: 2279b6c26d139a296da6d929233ccbc75e43aad6 SHA-256: 137658d182f620389950f337bd1c2c4dc196c78d144ad0e37a0c732961c889b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content. The presence of numerous unknown URLs indicates a broad attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f12b22f2acf---laxexivima.pdf In PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/11d872e0e23e6235a3afc901d6597c5d/seradufimimofavetujavi.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/dajipejisu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/96f48da54de92a4282d635eefdb52fbf/63415600992.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bomugaxaxusugavaxikisob.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/vusini.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083496aae650---zatosuzorafokage.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/85778048143.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/84280033513.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/70704106247.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2f331789---kexovufozazowifakev.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/berezatorujalulote.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dfe940dd9---wunusag.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021831221190815.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/24333013268.pdfIn PDF document text
    • http://praguetransfer.com/files/file/37452997623.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/36975217855.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/vasivemax.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112cc55ab816---pedopesirotakosi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/41136028387.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/lamejewojexikosolevi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da42246ac7---rupiluxanubivizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+to+dwg+file+converter+free+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 10476 bytes
SHA-256: 6da11ca4ec32a8449ced3a9bfed6718ab5078caff24b0d528f3801a76bf84660
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 17152 bytes
SHA-256: d76d9512be9ada16f515fb6add97d3ce47605c893d1def8874f16815dcf41e84

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