Malicious PDF — malware analysis report

Static analysis result for SHA-256 958c407acd101975…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 12:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5593c54656c35d16026348fd0a1badca SHA-1: a7fd56b4a814338c3ddf663cbbfb3d0ee3d25e3e SHA-256: 958c407acd1019758cf2afd5f39d3720d6d9a3cb8f030f3617ceed234ece0081
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 compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://floridainvestment.cz/files/file/58691356658.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/18208767000.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/a04e6ba3805a2c7ed62f12cf497ed206/14993578196.pdf
    • https://arab-hams.com/Ups/files/xukob.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/76827747596.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/bulesujawelov.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/mq2dtf46h0to4h0cdlfsqqkupu/52301732338.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2ddb34c5---jenexowidove.pdf
    • http://clinicaveterinariamontecchia.com/userfiles/files/88734319719.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1e0012e4---84616354705.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6752325d13---76517705815.pdf
    • http://aldo-ins.com/userfiles/file/gologe.pdf
    • http://scheidenschiedam.nl/uploads//file/nakuzenaj.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836efa455d3---5334602893.pdf
    • http://jeyadhurgatemple.com/userfiles/file/41910995868.pdf
    • https://hondamienbac.vn/userfiles/file/rilokus.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608573bb36f76---34513445795.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fb6ae6221---98023258359.pdf
    • https://njshore.drinkpoint.com/uploads/files/62479544457.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c079641118---nemotipidodenufitir.pdf
    • https://learningsolution.ca/userfiles/files/2917207939.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b65026e53aa---gomikejuvenevadidijopirek.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/80d2270797b86e5b7c76d728ad648725/felakuselajuxudolatur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+writing+task+2+example+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c306.bin
3d16b9309cab967e9839d5dd8dee4a853e5aedef02c12cb32bd8c98d3b4a3558
pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 11072 bytes
font_01_sfnt_off0000dcb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16792 bytes
font_02_sfnt_off0000f4c9.bin
0562a9bb26999b936dadad49969d354385fcc127fdd13cedfbc822f5646a0664
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 15892 bytes