Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac547f63d0dc11b1…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 15:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23d14ba7bb71ef86e94eebb77c17b848 SHA-1: 386266f6a0e72c6f08fd4407ac7d8f1ab999e23a SHA-256: ac547f63d0dc11b19c8dcea8eb9778cd449998fc1285a10aa2b87971a63c73b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the conclusion that this document serves as a lure to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://medvor.ru/uplcv?utm_term=pdf+file+password+recovery+software+free+download PDF link annotation
    • http://ascensionchina.com/userfiles/file/witoruwejonide.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/32330837188.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/65993505383.pdfIn PDF document text
    • http://mamitobe.ru/files/file/rilatutofulu.pdfIn PDF document text
    • http://bienbao.org/uploads/files/52496923238.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c016abb7043999bae8b93a78a6bc47e2/69537168423.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/51072896209.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4lkujku5t0e8u76gcg9j5n38ln/wufujobuzufasu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e362a15e51---mipovab.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/51411320014.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/30966177011.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/68557425135.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/lesuziw.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/dabeluvunajejer.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/rafegibot.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/vumoti.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b639fd0309---pafakon.pdfIn PDF document text
    • http://i-physiology.ru/upload/44304354574.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/simuvopexafowejofiban.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/1564815990.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/jexezagaduzefaledon.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/10151265196.pdfIn PDF document text
    • http://gr-chem.com/upload/files/lonolidufigusomimad.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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 10880 bytes
SHA-256: 9e35b591fd3b9ae2556688e3edd0c313caeb4711ffdcd4cf40f05c067321a2ba
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 16100 bytes
SHA-256: 20fbd0448c7fdf5b42ea21761e15497c887b929eace5ad1eae31c90378244b0f
font_02_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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