Malicious PDF — malware analysis report

Static analysis result for SHA-256 20aa34a4dc76bf86…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 21:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12f7e92237c84f1b35c3755724a58c1e SHA-1: 080db8dbd1511d79c3e1e5b1583e2b8e30952ffd SHA-256: 20aa34a4dc76bf861234beb30effafbc72ca13a85141ea2110f56650798e4e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the high number of embedded URLs pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=troll+stronghold+quest+osrs PDF link annotation
    • https://open-call.fr/uploaded/files/69465672133.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72187070772.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/39e4dbdb005dbd5296da46129f1ce741/kodepifawogom.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143b906a598---31608887070.pdfIn PDF document text
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/vipatulebezisapagabo.pdfIn PDF document text
    • https://ismart99.net/upload/files/bogerubevalijonotino.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/19704304133.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/59d73c26e27b47c514b6b90f87938484/lopexu.pdfIn PDF document text
    • http://jejuecotech.com/ckupload/files/57797495061.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/judigi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5dbedc48a---femosoviditutejozavamero.pdfIn PDF document text
    • https://dcimx.com/files/42157115488.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/58280266750.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/diwitegowe.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e0af36e98082493b301f647362b09461/repifogopexixivotak.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p204artpinl6edta0kgcgfi7ci/nurepawoworavo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc2b1de7e1---jifilanaga.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2b157bd30---zedakezuzifituv.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/51149628264.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/10b3446c3806d02e800303b18ad9c23a/xolexosag.pdfIn PDF document text
    • http://chinalabware.es/d/files/20158105459.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a83d343a19170b5c0e4fa3e1cf2af759/26575530054.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/51377058686.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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 17020 bytes
SHA-256: 729e6b030ca67d2028d000340eea3ded173fbfd09f7f5990bde80f63a50f761a
font_01_sfnt_off00010902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 10480 bytes
SHA-256: 44fc8852dd3eb6b82202579eb9fc39e1f9470c6b54c506c8004cdf5c676d6e5d

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