Malicious PDF — malware analysis report

Static analysis result for SHA-256 f805e1180cd33f9a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 01:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31f9539b2e4701b5c88341a537044f0d SHA-1: 49a415216bc6c0215f7ba1e631fc5883d70ad8bd SHA-256: f805e1180cd33f9a2423364e9ff490834de3925d48c5f295c146998039c7f26c
156 Risk Score

Malware Insights

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

The 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, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern observed is the use of a PDF document as a lure to direct users to external resources, which is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=biologia+perspectivas+anatomia+y+fisiologia+humana+genetica+pdf PDF link annotation
    • http://ccsl.asia/files/48052659921.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/75346323269.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/72885254875.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/jawobemopemi.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/7667986756.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/499vgg8tuu329oitd78j69a8rs/bijesosumebimamewi.pdfIn PDF document text
    • http://short-story.ru/upload/file/gifurunibegipagav.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1d90c8ac1---6577024120.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jn7jjo0rjg2hutqdl3cg7q166p/52621388840.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/080e3efa2e3ac4ec197ed2eb07644366/tozutufeviruwesizegon.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/d0oui2bgs25jq1ohmilo2g6tto/54642198792.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kuzuxunaruzelejokosomi.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/3063550968.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/75367866132.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fbedbdc71---bulewebizerodogiduw.pdfIn PDF document text
    • https://aashianarealty.com/file/seluwimeponupofu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/dawejixanewopetorova.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kavoli.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/lixularuzonub.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/73313815763.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lumej.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/56161539071.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_off0000bf0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0E 11400 bytes
SHA-256: 86cb2358a8700f246cb01ea8cfaf9c4b2698191213af5bf6bd7114a3d349224e
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 19040 bytes
SHA-256: eaff375386bb040a3fec77e82f894049ac11cb2a9b0c3d6e7be7f5f52d25bae8
font_02_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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