Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2457892b30c45f2…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 17:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfed02add6330a34677c79119a6534ec SHA-1: 95aeb3dce29f4533323a2c9751a0a4909f67b7f5 SHA-256: b2457892b30c45f2b25646b2e584f88036c7874632256907af9812fc1b49447e
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 indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nyitotthaz.hu/userfiles/files/79693300219.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db95baa05---lafubanudoromudenis.pdfIn PDF document text
    • https://avenue102.com/uploads/file/6565119910.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db63c22a5b2---78035985296.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/68027046158.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/99150228501.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/93349871469.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04be80ab51---37151926335.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/57172710106.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/dumiwobezofipuwuzalipa.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/rufufapeludixevirirodim.pdfIn PDF document text
    • http://camwater.org/media/files/gomof.pdfIn PDF document text
    • https://datajournonepal.org/files/50492961838.pdfIn PDF document text
    • http://sergeybazarov.ru/file/11512967140.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/ramutuzemokidiwitutej.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u69au14gfo80cm2aookel8v6dj/safamolazaf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8023a6478c81040e6efbeb1bcd72511a/povidapaxipelatalerijikid.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/fafukowa.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/83008030833.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0145hra5i7c2egdgiifjoj6136/27635121070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wansview+q3+manualPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/50553350256.pdfIn PDF document text
    • 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_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 20352 bytes
SHA-256: 65b792ff9bfc176a73b066c3627f7bfb1d5f7e6d3be63904d1b9aa82cd882cff
font_01_sfnt_off000133e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 10512 bytes
SHA-256: 49ec92900b9a38aad203d6ff55d6676d39f578a84c8d56daf1c00f688bd97027