Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f27acb37f47517…

MALICIOUS

PDF

73.0 KB Created: 2021-06-10 11:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 22f1edb698e391da1832fc1f957c285c SHA-1: aea80bbd41cb2cdc9516289ef59454416bbefbfe SHA-256: 21f27acb37f47517bf6fbbafd0eb247477802402d3a7a37efeebe23d3d4beea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The presence of a URL with a 'utm_term' parameter suggests a phishing or social engineering lure, aiming to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ketchas.ru/uplcv?utm_term=baaton+ko+teri+mp3+song+download PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607932af00691---60416897299.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2d2e0f7dddaed791cb66178180c7d7cc/21547093845.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4007c2b69---wefagipo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a196807ae47---zivororuvimuref.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a55fdb04b---tifubututelumesupajafitof.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/rogukegurijakagowekeve.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c691d79fc---luvuwataxajituzapikipiwa.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/zomomuwuruwuj.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/643df5dfcf0bc0090f18b7b2229212e3/4413274238.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b685aea4c49---gagilaze.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/39312188278.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608c742e7793b---95748145677.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3f15a5a2---siforapunoxapujugodiju.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/8302142711.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/89396476802.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/70234746794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 5648 bytes
SHA-256: 319ff7a506c10f27d22004e55fe1ea70d241e36371458e089535efe81601b90b
font_01_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 2920 bytes
SHA-256: b4f4ea63665be1a1c5fab6f907a4dfc49a667a9b2447a54c48ab75fc5f4f287a
font_02_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10836 bytes
SHA-256: 0dd8d8e0e0b8c255a49bcdfaf0e385887cc1e60e8fe092a32f36d01074e59982