Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37ac84692f72bee…

MALICIOUS

PDF

93.8 KB Created: 2021-09-17 08:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7d06adacebac47d59c7bedd17d4cb17 SHA-1: 7f9f5e2233ff50eed03cd564d941c96ced205749 SHA-256: c37ac84692f72bee946948101c7c9c76718d5b4751ae21c6c5329d0333f8a4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

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 https://queure.ru/uplcv?utm_term=gta+sa+android+hot+coffee PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f431c122aa---79501377332.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/86880256704.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/kalofogiza.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161345b88e1b32---zufukilixenovazituwinilap.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/27091394996.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/vadefewiv.pdfIn PDF document text
    • https://loyd.rs/images/file/55529019350.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sebojuxibipijob.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/68688668200.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/zitivutizikimixiturolobof.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d029c7eb7---pogakax.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/wajiwu.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/15449464407.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/tuvapiwudoriju.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2bbbeecb---verizokolepuperige.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/47166761009.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/74047458239.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/9268697083.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/50328490.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/14362126750.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_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 20888 bytes
SHA-256: de7d3c9e950e840cfd65e82af43cb92f74e90ee72b8c7c5b279df51df49b8263
font_01_sfnt_off00013971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13971 10564 bytes
SHA-256: c94c1f1131496c520ce5cbc466c58c8fc0f46b68e996999662c74975bdae4a5c
font_02_sfnt_off00015189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1