Malicious PDF — malware analysis report

Static analysis result for SHA-256 83db767ac0da8c52…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 18:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66adfd7ad17112e399171d2e8d10daa0 SHA-1: 7098a2e177e968bd5121738e23b329ed5342ea69 SHA-256: 83db767ac0da8c523aa869b4fef8ac5ff5101376f30192c57fe27c260e27fe32
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of numerous external URIs and the 'link farm' heuristic suggest the document is designed to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=moffett+forklift+m5000+parts+manual PDF link annotation
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/87e814937cf58ffb87dc79dd7918b4b4/bavobas.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7d3da23a---32035484749.pdfIn PDF document text
    • http://shrootgroup.com/upload_fck/file/2021-7-21/20210721181309491931.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/vivetenurexuziwizuwo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3652d135---lolasesonivagibeb.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/lujemu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092389a2a92f---87813440215.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/11402641336.pdfIn PDF document text
    • http://msiutilities.biz/documents/funuko.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/wexedake.pdfIn PDF document text
    • https://olterus.com/contents//files/87684775391.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/66830479331.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/56697383983.pdfIn PDF document text
    • http://artospace.com/pics/file/luzatizu.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/49275574020.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309077ed075---22219154840.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d3d2059d3c557a89174292e38000c728/83878727230.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/fewufosesatoxoxonibavuni.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a570882fd3---monuwerinunesapav.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/26531169337.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/lqk27a0ev1d51tn6p3j3infagc/90590941268.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/sevijamanupaboxapavetek.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30b567fe---21778704782.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51889271f---48911897221.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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 19672 bytes
SHA-256: b6be753d8a19feb9eb9d0a86e9e64ec1a94e68037ac154556a375e5454ad5501
font_02_sfnt_off00014685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14685 10960 bytes
SHA-256: 2310e3a65d2403370d15e0e921da82fe62b64464cba6e6be996afa56af1e1009

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