Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9aafca90629b00…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 08:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86dc8653dab0fccbeaeadf86bda71596 SHA-1: bee4800e2fd0b1e31c50fb18f13a9199518cec68 SHA-256: ec9aafca90629b00353067d65693e0fc5c70cac1cfc2f2f15ef1d177f8750a5c
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 ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farms suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d042e0d45f80b66b6b56381921ce5a4b/56340435301.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/08700cd173273db7f2d2ab3a1fa81488/xikikojetu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7bec2353c92cdc1c716e9795560e0b6b/7993066734.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16111195fdfbfb---8306717993.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5106aec0289befa667de4da8a605d37c/4317828322.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608744f7e2289---wilubivuvawoladejezapawe.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/55895477088.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/263d9b8ba19760a297ed04fc4a2653ad/86369317585.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/7726518032.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/texuzeragimowebod.pdfIn PDF document text
    • http://finchamauto.com/pics/refitoratafulox.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/24196929612.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f1c4643bc2d3ee474e5ad80187a7da27/56115378559.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/22975903032.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jabot.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/58434419189.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/tinetutowimozik.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2976a475d21c04003f3f9fafdf8ef6f7/6246485964.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/41174753235.pdfIn PDF document text
    • http://candientuvibra.com/images/file/95539521877.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/11152284010.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/bobunuwudijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=como+usar+una+maquina+de+coser+manual+singerPDF 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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 10892 bytes
SHA-256: 0f4a62d558a5fb64984565a4507aa0a764ff8afdee0b7fb46228cb9daec252db
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 20980 bytes
SHA-256: 8941f67323b0a7c668423d3baa21a0cb1a758eeb5be54eb97d942e19019b45d2