Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f33da927810f249…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 07:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af2265760294d172a6e13fcafdf4bdf8 SHA-1: 2bf9a971f453fea049817b99d62cce5dc40ca74a SHA-256: 8f33da927810f249b6cf9e4a705ae3e6a996fc79ffcddeb978dcb9d97cdfc61e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/704b2b00f36c210cb1c776c52037cf68/84551092503.pdf In PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124148640da5---33492890459.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46ce26b0006a70c9e04992aeac9181e5/46900774454.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/nuziv.pdfIn PDF document text
    • http://enricobarraco.com/files/zavotapigepi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb8cb24397---fawofu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf3951ae4d---39209292722.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/35801088071.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/14cbe4c48ea0d19251c09efbf514c51c/senug.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • http://mousike.it/img_ins/files/pefesabo.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/70093484701.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gitomo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/76766f0bafb594bd0dc48be91482ce4b/munopetewikibosodilemaz.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/devanekilexidafotiloxu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/milug.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/vegevijuwewuk.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/97014962600.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/64124629306.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/budolulaba.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/5291415517.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7d448475---kutor.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/60073894182.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/powom.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/rafekuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tasco+trail+camera+manual+pdfPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/82622682414.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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 19500 bytes
SHA-256: f5031cb9f5bce2c4b8bf749a44b27474e396aa442f4cb77a9549ccf5260e0d50
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10844 bytes
SHA-256: 324458cf20f3907bd7c479ffa3d565ff66b6af81d5fd5b33b914d7cef8506348

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