Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fea903ad9acb5d…

MALICIOUS

PDF

88.1 KB Created: 2021-08-10 00:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20f08cc5321a636003f5c6fabbb8b3e6 SHA-1: f770374afb411c3c1052087a375a1e8c707922f5 SHA-256: 33fea903ad9acb5d5193eeae95a8f981451f9b7cd0360e969c939b4c64097208
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various compromised websites, disguised as driver downloads. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs suggests an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://krisoc.ru/uplcv?utm_term=download+synaptics+touchpad+driver+windows+7+64+bit+acer PDF link annotation
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wapovit.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0384457ff---21444655872.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38cf432a2---gegafotifov.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/19960362661.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/71298654179.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160753bca27664---24376680699.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/razumevetulegagunufutod.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c25e1bd29d---69448467736.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f4ff4dfcaf9b5662ca4b9440c7ba2ca8/58377470882.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/88343381969.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/jadofogudaxamekupeg.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/71160542903.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wirokewu.pdfIn PDF document text
    • http://midel.me/userfiles/file/wulujoperigopepup.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/vekaz.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/89638471709.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7c8f7a6a83820a3765fb9239fc52cb22/dijevofixuwopatovoporagab.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/kojowiwogesurubigot.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/19943263982.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609823c5582ef---naxemorivejebutira.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6fmd793q68g8sf4qpvduuehc1v/44528855275.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a45d57deb1a---dopinojosopixit.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2629a134---80245507474.pdfIn PDF document text
    • http://policylic.com/uploads/files/sesanevodu.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/3707271692.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_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 16908 bytes
SHA-256: e2911f5d9e367dcefc7a078b6bab82ebbcbca65a164bb91523f3adc168186beb
font_01_sfnt_off00011e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13620 11416 bytes
SHA-256: 60c7cf7d2fffc4507129bd4530b83f686a8ceb83856b9dbbb9c8174883fcddc5

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