Malicious PDF — malware analysis report

Static analysis result for SHA-256 89da976075170796…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 21:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b700ba439f82a11351a3660ec394a6df SHA-1: 6bd6ee4638737255e7c57bba91b99ae00ca09990 SHA-256: 89da976075170796f538433021f7b358698b35d4cc11a6d08d061618870ee04e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. The presence of multiple compromised or suspicious domains reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/jhimhulgfngoniiklohch6iikn/61123869229.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/dubiwiga.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f91cb079c88---61631329355.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b060bf3dbb2---33631269716.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/70376956028.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/696bc0422bc97b5522ed34775eb7e1c0/83295575681.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/26129564925.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dd6d3a3d6---58514129658.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadijafetoletiwemulutidi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8e6c6c0d4c341c44c62a1fd11a2dbd99/satipupevubel.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/360a771ed9b334402d202df5ac2a8c63/norobulavaful.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/53089617852.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111be8b8cab1---tewute.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/10936981480.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/18062981729.pdfIn PDF document text
    • https://fototipia.hu/files/files/bizubu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/sorurawovojexipafuzo.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/rarelura.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/783c6ec9d0272d3369c39cd8d7367695/sixidete.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611732786113d---25920392720.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608803f49066e---wavopovojifagapijilut.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603142034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=escalade+les+noeuds+indispensables+pdfPDF 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_off0000c6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10640 bytes
SHA-256: 7d4ebd40935a07554f7892892c0fcf18427f3824f09940f5b28e8ded35a97821
font_02_sfnt_off0000f73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 18856 bytes
SHA-256: 2a862a0b99b77e7573b773c2fb139f25dd666f676beddea28fcd8118cfe68e73

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