Malicious PDF — malware analysis report

Static analysis result for SHA-256 e69aa37b41f51f9e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 23:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a22e47a6ac0f9e2ebd736af7a58040b1 SHA-1: 1ad978afff50a219e695010c76bdd1572844c08c SHA-256: e69aa37b41f51f9e93bc74d8262e4e8e967841cdfec7fd36811ddaa6b52b245a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites or use disposable hosting, indicating a phishing or malware distribution attempt. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to redirect users to malicious content.

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 http://xn--krmer-dnnebacke-1kb72b.de/files/file/68548547424.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc8619576b---jiziwigarugowatevonojel.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4bf0ba3cd30f1ddf0651a9985b91623c/45824185190.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tutitarujowakolujawokinum.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/demodaxiloxijexazuridub.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c89b2646c4---42944173540.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/61716ce2d2dab14619d9a9157c91e354/77683339640.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/sikakulum.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zulatatanu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109221227126023.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/numugodesubigamufiser.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/36328824532.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/rorasuxe.pdfIn PDF document text
    • http://getvisa.ru/images/File/doxefozop.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/47014436931.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/85464336295.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zekibebuwax.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/28042644179.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/babukezitazudejitak.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/85c9e5a9193ccc42f39ab4673ca0ded0/faxod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=precalculus+mathematics+for+calculus+7th+edition+pdf+online+freePDF 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_off0000ac21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC21 16144 bytes
SHA-256: 68ebf21eb6f00802cec3ac5ab27ca5d173f2bb1a7d3f7a24db747a61dcaa723c
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 11036 bytes
SHA-256: e1a6f0309ab0d94367f9d374b9a8b978697ed1d316f77d7a203d3ff2bb327f29