Malicious PDF — malware analysis report

Static analysis result for SHA-256 1545429cd32e6dae…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 19:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 72fad9d8cb201dfb644be532d5dbd72d SHA-1: 2ed49c9a343ca34035b07833311c527241593d3e SHA-256: 1545429cd32e6daed3dd9b82973c968bb7d9526b6c93f81e113e532c9542ecea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=chintu+ka+birthday+torrent+download PDF link annotation
    • https://jajugroup.com/ckfinder/userfiles/files/63549113460.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/49493091534.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/resilowipalunujotonuda.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/50806981260.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/87919547956.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/loxaxejisi.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c03c3e317---72136940104.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/24396820135.pdfIn PDF document text
    • http://apart1day.ru/file/veput.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0c6a534d4---tizabepakofetififuba.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/35329947446.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3658b0be29a50d59444a04ece3fdb2cd/72584907426.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tetagemajavovamasumibu.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/jajuwuto.pdfIn PDF document text
    • https://securincasso-online.nl/ckfinder/userfiles/files/fuziwikedefopafawepevin.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gotobunotijarotanurix.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/wafazu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/49790264819.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/38318624012.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338c5bde4d9---bavurekokafatal.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/fomabofus.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/73020524983.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_off0000b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB400 10740 bytes
SHA-256: 7a60fba59e140fdee0a875117d9bdae6ae297e3b2f89de5fe5313c99cf333c21
font_01_sfnt_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 17536 bytes
SHA-256: d9b745a95ee3ad31acce59469f47ea4dbce95e5cbe8feced97644df39753a927
font_02_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1