Malicious PDF — malware analysis report

Static analysis result for SHA-256 2895196622240bae…

MALICIOUS

PDF

93.1 KB Created: 2021-09-01 10:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc89848629f81f83198fea57cd739ab0 SHA-1: 6e96813a5f0380d11117a10ef978c43ea6c371f2 SHA-256: 2895196622240baee68e002d35f59f4629f2f4c6f0a04083991e7750fd46985b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://synerhu.ru/uplcv?utm_term=what+does+it+mean+when+your+right+ear+keeps+ringing PDF link annotation
    • http://e2ingenieros.com/ckfinder/userfiles/files/wenigajuxuxakufoworiv.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd5782982---50239491719.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/6316068846.pdfIn PDF document text
    • http://saydersan.com/firma/files/78239959324.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace68953348---20543267869.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070704fb04a2---71563506055.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/47c1137b817c933549588a2062224345/jefujesugija.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e717ac7712---javepaforer.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/89953441896.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/xazavidabonilagu.pdfIn PDF document text
    • https://foulardfotografando.it/file/22382570322.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/37839958877.pdfIn PDF document text
    • http://hopkim.vn/upload/files/bulazew.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/75785219331.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0a994cf6443d48edc69308de7bf48567/24998497087.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/57264770184.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kukemasivuwawipulito.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/gadodimoja.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd16f1f64---vemejuxopafonisunujes.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2925cb7c7063398dcfd22097f5603264/39298658675.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_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 17296 bytes
SHA-256: 7db60790be463afb4712e4a5c65442562b37ea659728d0e444be277671166c9d
font_01_sfnt_off0001351b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351B 11180 bytes
SHA-256: c3fba186583d979a3272da9374573921c45ab0aa3e79d668ba902f7149373023
font_02_sfnt_off00014ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1