Malicious PDF — malware analysis report

Static analysis result for SHA-256 5509855d7ccaade7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 19:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4687e9b31277faa9b221ffd346d89634 SHA-1: 2a61fb7ffb68c649d34b13d3d0a6e16d34810275 SHA-256: 5509855d7ccaade7bf4395e60462c1ff1fea81b9379e339df3dcee16f1c75f5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=canon+powershot+elph+160+digital+camera+manual PDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/gojamiwivasifosifi.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/sasasolufir.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/59037386805.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/30f558b10a29f64d7bd5434907c81825/36611313153.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/xotimuwepemujedid.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/43903ea794ac5c43bda2cbb31e530eb8/xonibodixuripenezep.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160701906789c8---75916985131.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/bomokivuputavezovos.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ferifubaxedofo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079b90725678---30663676394.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/20493270552.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210808015910.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/13514383935.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/bekedabexuvuxawisu.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/43410602807.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160983004e0785---59104176202.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af85a84be---gowilekajerimozo.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ada6312c632---zizopumawajomod.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tamodupokaroriduziga.pdfIn PDF document text
    • http://446888.top/userfiles/file/14179107033.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/17816655308.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19f5cbd4---18683715324.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/75535780130.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC047 16208 bytes
SHA-256: c8c38fc1816a6c85b59711fd9bcd63895ef2813c7fd1d564471e7f69777aefc7
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 11520 bytes
SHA-256: 0b7c05363573a80b704ed0dce757fcdd09a8cfc42bb4c79f66059f34ea639391

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