Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec29dac55d7311…

MALICIOUS

PDF

76.2 KB Created: 2021-07-22 01:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bffa6256c0b8e2dab46ac094bc761e3 SHA-1: 1b69f4cd0914187bd8ae9e5233e78a6774d2977a SHA-256: 82ec29dac55d7311909c87c35076a1272accc8e21e32ab122b3c9a87f162c0ca
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609490a80dbf0---soganuzuborodanad.pdf In PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/dogadizodu.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/37867618183.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f66d7035b---taluti.pdfIn PDF document text
    • http://didula.com/img/file/75288766188.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9c79317---85330705393.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070704fb04a2---71563506055.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/r4kofra0gbe5ok3dqnrekompoa/bafunokerutidamaxus.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bc0cf7d6---63430363547.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c4c6c1c163ea26301e361a126651761e/gajulavufo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/24821506102.pdfIn PDF document text
    • https://epiphanych.com/images/file/gojexal.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/64384819136.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/sulawajofobesox.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/lijog.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/42706412200.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10868f092---9826688323.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/14597574958.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c3aec456---38482399838.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9a5081447f6469b2b04a2667763fd4a6/8259752804.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tusafamofedudepudawozax.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/76007504878.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1f5f77ddbc118c2134cbd263ca4ace19/gujuvodubuvoxifakudeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=warehouse+incident+report+templatePDF 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_off0000c9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FE 10872 bytes
SHA-256: d000323409f457bbb20486c18dd134b203d9aefad87ba1305ce3117020abb8e1
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 15476 bytes
SHA-256: d6fa8ec94360a4470ed7e494f25059ce979ad28e6343c699452dbfd021de582e

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