Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fe02519e62e8f4…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 08:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffe2671b78506c23a759fc86815c24b7 SHA-1: 105fb7b6168e91bb266fad2622002a4267117ca4 SHA-256: 83fe02519e62e8f42d81d4ab573a318e992a0abb8918014ed950308bfea34486
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure, combined with the presence of embedded URIs, indicates it's designed to exploit user interaction, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=free+war+movies+to+watch+on+youtube PDF link annotation
    • http://gaineyranchaz.com/userimages/wuvugok.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1cd715614a3e7f518de7adf913621d33/gagojubetotuf.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/83741465550.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/sizofuvataputodejosezuju.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/69790344719.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5ecd92e3c---78332630345.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c940d25d0---noridigituxidima.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16152656b99f3f---44663468470.pdfIn PDF document text
    • http://jainfarms.com/uploads/rabodakezozuxovuzivodesal.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/ketilodo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/367582448c7b84f55da9189b50d5c84e/33484870755.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/8642375539.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/78777630604.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/37020858826.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148018626bad---dosuwale.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/loterufakuguvutodalafanuw.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/60249171955.pdfIn PDF document text
    • http://rubensova16.cz/files/file/zufinuwobeduzulax.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/56993243200.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/94279306907.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/98375253961.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/wonitemu.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_off0000ac90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC90 14348 bytes
SHA-256: f7ac272aadb578405c5c04e3a7d89cee2d36f15df78eb73d0856a4a9b4517924
font_01_sfnt_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 10932 bytes
SHA-256: e7aa693ad6be4152cf01cbeab07385cc3d319bf1a3e4bb439af7eb7cbcb31f6d
font_02_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1