Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c460a0b37279d7…

MALICIOUS

PDF

97.3 KB Created: 2021-09-02 20:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1f1af16c5432863f562d73544c38df78 SHA-1: c5130ec0bfceb401ebf084a830a4ee9b03a9d909 SHA-256: d2c460a0b37279d77c182b696835d988fa7815d7541ca375c87f794b3b907719
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. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates links to WordPress upload storage, which is a common technique for hosting malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mfahk.com/upload/files/4321575276.pdf In PDF document text
    • http://paneldeconsos.com/userfiles/file/16366442488.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zuraxasaduwakubaxar.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d8161ae7b0a8a71525e1edc81f6c8189/49154648400.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zepamuradub.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/55293476808.pdfIn PDF document text
    • https://ijpdua.com/contents/files/bujizapizizanafuxipopos.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/60260911167.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6359c000c6---58658507448.pdfIn PDF document text
    • https://netpage.info/userfiles/file/31017098500.pdfIn PDF document text
    • https://ever-progress.com/upload/files/39480672228.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/62230636376.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a5dff53---3155588579.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/653vo2vjob8ahk4a274p8kmrs8/penadomeseperedikafef.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/rijawuwujoli.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/76559168230.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/soxiv.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/fipivuxagowegivak.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/fawagasupuwa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c3d5060515f7bd4b52a7fae5831ab345/27424857462.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160767a0b806c8---95512896303.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/safozun.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/30266678521.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d635ae697---9583998612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mitsubishi+pajero+sport+2000+service+manualPDF 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_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 11312 bytes
SHA-256: ad7a0721be70e2b3a3706ce7bb9e599300946e23f89a4760ab2e66bed7283ac0
font_02_sfnt_off0001459e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459E 19216 bytes
SHA-256: 1f21d2f8e4551c56623971d4dfe0f9612ea8b54e81b2fa76767c4987906029ce