Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab97b0749898c4c…

MALICIOUS

PDF

71.4 KB Created: 2021-05-10 13:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83cfd421c8bbee58dce69105e44c2f75 SHA-1: 469de9c69a584a71684e0a6975729ffb03392f4b SHA-256: 8ab97b0749898c4c697ca206a75b0a66ceaa7e0e3b8d2980935f165b196be141
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=jeep+cherokee+limited+2019+manual
    • http://antifftech.com/uploadfile/file/%5C/2021050203513151.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/h247d312ta752f4ljmpu2ddvlo/87557404252.pdf
    • http://atthaya.com/file_media/file_image/file/27373764652.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/pra3djo7im2qh8c9epslnsqit3/gudubawivanabudamew.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/95754754675.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ja1pa4gvgv60nk740e4osv2tct/55169795832.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e798e594484cfce79b66b06f0e79d0de/17824833262.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rpadb48qnl728m7q25gbf7o523/34054906288.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b751f30d3662d10e5963ae324389c10/novev.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gt8al9fvt7g39loqft13hica73/wapege.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/480bf5a83356588290e66fa2ad8f3d4f/webubibuxul.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da812a9a9d---43840803670.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086995f35435---78682571895.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160883b32e9a12---18725957390.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3ca20e7b---17460792000.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ddccf185---23957842302.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e42dd7dfbe5896b0be785db6467ae8e7/81402576202.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71d.bin
182dc6a03b04fd2cfd149f30f8eddfffb24366a621cc7eaccc73cb07efe9a75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 5668 bytes
font_01_sfnt_off0000ea3b.bin
c193c865d2cbcdcaa571549fa9a76c7945f83de5591387f6c8d94a8123d469d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 11336 bytes

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