Malicious PDF — malware analysis report

Static analysis result for SHA-256 6adbadd3a33c20e9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 23:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c419627381a75cc32500f07ba661ee4b SHA-1: 600d2b43d579618fb9a216d78cac337d42fa2fd7 SHA-256: 6adbadd3a33c20e97c131154ecc1947ec8db8bd173925e6eb8a5fa4cb9ea0284
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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=dodo+master+apk PDF link annotation
    • http://anhhieu.vn/hinhanh/file/20073236548.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/42044534330.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/93835834666.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/77166394968.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/jaxaxegezuluj.pdfIn PDF document text
    • https://kratky.eu/files/file/98096913521.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/toborifibadixizekuludo.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/mikigijizifikabanon.pdfIn PDF document text
    • http://bdsductri.com/upload/files/sukeg.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/24218221625.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/87663490473.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/welevonotojakovor.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/tl12158u432b71dh8ro34ul277/35884737004.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5f10089b---fojuvenaxofudibixejaru.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c61e314a0---675042049.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/32230750681.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/95334311580.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/xuxemuworaje.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/menetojigitunutebobimo.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/dimexu.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/xaxewifam.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/ganavalix.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/10785731241.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 10404 bytes
SHA-256: 0711a3afd7b96b2251b0af10201821c1a5b8b7a4c4be8295b064c724c10e2e8f
font_01_sfnt_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 20760 bytes
SHA-256: 9f35b68d29267cd6f97e8c93f8753315257199944643792d9fbefc74de934b9e