Malicious PDF — malware analysis report

Static analysis result for SHA-256 e551ca6ceeac5de2…

MALICIOUS

PDF

134.9 KB Created: 2021-08-18 13:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e8b6e20df136feb84232ed914153277f SHA-1: a0cb4ad1accbf9704a7472ab5a4babc92f4f725e SHA-256: e551ca6ceeac5de243f4d888c7871f9ae7dd9a316e4726697b884614c8cf5b4a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://catamma.ru/uplcv?utm_term=warhammer+40k+9th+edition+rulebook+pdf+chomikuj PDF link annotation
    • http://thermcom.cz/userfiles/file/godapafajusuzitaxazu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vumorelixakuvet.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/94550752372.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d25b6d2c---12290162700.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8b0c3365a7dda4ea529db0eff5e6a89c/56707774105.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/bupurasevamomofukefumema.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/zokinika.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/cu8iilni4bu31d831homc7ppq2/6997365138.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b431d98e3---jabubetejotojuj.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088480194d4c---84299583497.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/513dabdd181b335cb0dec86e55b49d1f/lijavonipopagironuxiput.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4e1967efb---51441481414.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/fapewawemezoxel.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/tasajilalunobaladofopa.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/29868461305.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21668704945.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/kowobirinal.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/xomop.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2dd5508d8---mosutagezasedug.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/36159701599.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/guluzuzepeverufajozi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/476aa7660240f28a8a9d535d61c049b1/pokesebulole.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2e503fdfa67f8911bd2548c72c4481ba/39260221963.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f4eab2dc9---10638938489.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/86625991154.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/48117541630.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_off0001aba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA5 11540 bytes
SHA-256: 21c329e9f6ae64392e4cb0a631cb3b23af661f945e8070dc89860308ca9f8f01
font_01_sfnt_off0001c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C68E 17948 bytes
SHA-256: ff12113bc2794f41bdce2efb7a08711aac1642d1d5b92e899f95d9f25546c46f
font_02_sfnt_off0001f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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