Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df285196901f276…

MALICIOUS

PDF

83.6 KB Created: 2021-08-29 11:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c298b660aa87f78d91b6ba482cdce71 SHA-1: 39ca09166330b10ce4cb4ea4573162a49eace916 SHA-256: 3df285196901f276e3d82f92fcdde2c42366302f8054a86bfe47a0a9f2203a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several pointing to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of links to compromised CMS upload directories suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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
  • 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://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b251c7a34ed---32807981085.pdf In PDF document text
    • https://epiphanych.com/images/file/potozeradizoxu.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xakinolibawabezosimoj.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/lomisexoroj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2ca8e74d150a3334e8ccb1df65b7696c/59059099766.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0dc5ec61e6f8af7ec05ce590014f05f/pewosalalexote.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/kusoxurogubejomakubar.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/92221866100.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f857ccb21---kufexeregowen.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3082f5bd---45567989146.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f83160055---goziwok.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/11811557006.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/98176849944.pdfIn PDF document text
    • http://fittbikese.hu/files/file/siluguvavokedubupujete.pdfIn PDF document text
    • http://3will.org/soubory/files/22362481136.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8cda2b148---93293728514.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1625dea49af4d59b53478a9d7e92905/gotawo.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///ririnulirelagebeb.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee6b7247d---rejazikepuwope.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/gatusimiroz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gn1ktmtv0r5qb1s6iubd0k6m3p/99544128623.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ae1aebb---fulejazumikatikarodudizom.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d39e93d520c---53385308422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=action+mmorpg+androidPDF link annotation
    • 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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 10492 bytes
SHA-256: 6e7076ea0a42d5e9b6e625c4a2f36535d6f82617b3acc678abd9258790fb6d6f
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 19780 bytes
SHA-256: 292c8b63082793c7ad1058c1c4a82a2ef40d90b17b06504c28648162eea3eb73

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