Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9366e951212e69…

MALICIOUS

PDF

78.1 KB Created: 2021-07-07 11:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b87c04bfc839889e264df82be09f0f4e SHA-1: 01cd995b61e24bbac665a7a95e9846cc10d585ba SHA-256: da9366e951212e6908b00818e210528151e4cf0e4fd2a7454b03bb230dd2617a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/70a79464a5f78c1dd229705318af3e5d/gefofuvesine.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef98a6848c---vejavaz.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/a1055a5f17b813657144cef118861c55/likaruba.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f156f9fc23---15216684170.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d1064e06af649e5c378c9dbd512298bf/49388679523.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160962e4729b94---fexixatofafamit.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e7c86aa2---vomerijedisotikepuwubut.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7983df16c---29802543009.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/2168802571.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c74256d0c58---bumegavazitalepa.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d511290e53b5a7cc5aa3f108c04de0b1/xunumasijapubowibuwev.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609910ca72451---30585937920.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/88241185851.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/596c4473d1d4ed5f417140649737306f/goxewibezel.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1efc12943b---31029314256.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kowapenonab.pdfIn PDF document text
    • https://pmms-online.com/assets/file/xofaruzipeweteparibigive.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160946588a822a---15602470873.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/xexiropunazenarofekoxi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9ccecef8---46194667683.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1624368834fevepu.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/23906019570.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7051f3fd---balakirabajivupetabuvuna.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c52243024---gavajosirun.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///pejefulubavugaf.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/45286389168.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a3d96495---pivodewewufededeviwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=what+was+thatPDF 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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 9692 bytes
SHA-256: 009535b0620042920441be4d84605c967065f3d30d6edb691a799a26f9b9ffad
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 21164 bytes
SHA-256: 618de989ec926254855f7d2ffd6e22eb4579fa76838c2dd7f657bb6a3afd329b
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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