Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd58782331a3a418…

MALICIOUS

PDF

78.1 KB Created: 2021-08-20 07:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dd00de9d874747f91c5084b5d254970b SHA-1: 6af0348e513e06f6f31a90371d982065626922f9 SHA-256: fd58782331a3a418d4d12ba988ecf86327e3c8e6919f5f228de3e0359378b10c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6314

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://mjsolankifoundation.com/fck/imagesfile/86235295486.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/821eb08435757de9bf306595c9f03867/27436326265.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/vonifobazavigobuga.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/49774522335.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/radavubakavukagipabavo.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/zanavupanivatiserinobakan.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/55511781434.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/nimimebu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c864541c826---xiwapuziwarapezowokoxi.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/dafuwusulin.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7f157f7c---14877945888.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8168a71fe5---39795053552.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16108a1e8766fe---69115680753.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/26844986770.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ec3ba6afd12008bb69daaec66230f0ef/dimawanebazepixedisa.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607032bc12b76---13597658579.pdfIn PDF document text
    • https://o-dance.com/upload/files/92016449501.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/t62fdi8lvrli1dc5bunv8tnql5/pelemudobewo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c989e830de1ac22f690945f3f739f18f/32739421264.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/12474488924.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/74061212820.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-10/images/files/lozexewewotuzebitemenosuj.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/41174274477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=elan+definition+wikipediaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 10384 bytes
SHA-256: 98c8a3e6d73ce7e9807a8a18b0c50401040d0d8f92c094545ff31a2187d2129e