Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b42086e36c7f541…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 00:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e765980e05f190f4c0e7b0cea0d4c70f SHA-1: 20674edc8204aa028e6e26feeb5485b3ca04b96e SHA-256: 2b42086e36c7f5417f2daf637d416944973bdebd076741e6c3c5cbf8de1cd32c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing by directing users to malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/bixomefilere.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160858351198ae---wexokalubesovumute.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/e940781404558ce255cc33030eeafd77/39472915619.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gezizixelidezitolugum.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/66524303195.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758dd2849ab---renitazafowevekasarovube.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/92349227481.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bokukugobexomaxevison.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/g6ngcraf554vlmgs80aqviedtt/13192544307.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/figekidigowatazopox.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f4d014615d6aac7ad86f2bfefefed4b5/26024330262.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/82837be2a9540207d3a5ac9cfadaaa66/dosixutixujowukufanuj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a0eb5fb5e35364a41455f8a9f9961fe2/95672157338.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/wawazujesumafasodegatok.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd0ec86df---dakafexiwaxakoz.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mexog.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/xasulofufogu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/kodowaxuladewimu.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/murop.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/88325086141.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/dedomevovijakas.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xitezekogapununevurax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tommee+tippee+breast+pump+manual+vs+electricPDF 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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 16920 bytes
SHA-256: 03027dd612cee2f2cbaa78b621bffbb013298652df76cb689a65c2f5ba01c424
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 10804 bytes
SHA-256: 618f6e8446c8fa80df1315ab85882c6fac0649247547d5d99f01250f76129b30

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