Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4dca7336b066e3…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 10:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f375e648b03355be9afd3354f4298b78 SHA-1: ef4ce1f7925eaa85324b193e662823dbbd3d6630 SHA-256: 7b4dca7336b066e35372680397268116c3ef0ec44b91b9c2ead98375fc3b5bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://archism.ru/uplcv?utm_term=alimenta%C3%A7%C3%A3o+para+diabeticos+e+hipertensos+pdf PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091be7aa767e---40303395743.pdfIn PDF document text
    • https://premium-house.uz/images/file/zejimatunamawaketaluvuz.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/mafifananubafexuriwiguxu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d41ed5d3---kagufevosoxapujowuzexem.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/21376870911.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/jatavowunuki.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d22622600---16791207867.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/1a487ff0aed850d6040975bc377d2518/23719491766.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lovuxipaxuxenifi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622ef2f9c3---rujugawoduxipuwifijanag.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8c45de7b---nixukokivetenuja.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e70a9a61f---vopadesej.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/gafid.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/70208075137.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/namaraziwopuwedasesureves.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/21158706385.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083749f840b2---34145760469.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/jowus.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wevetef.pdfIn PDF document text
    • http://julianina.de/upload/file/98917563711.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/72694780198.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/3838887280.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c5efa541d5---55997352294.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-14/20210614092040620642.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/robisekirekizi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1h0cqjnjnmghciqh7kkaspqjnk/rizuzafuxogelo.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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 11468 bytes
SHA-256: 3a7d445f86040c99d830b1c43aec6b70dc7e744c7a7c5e25ec87b204f7fef644
font_02_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17260 bytes
SHA-256: eb6578f26e0e9de736dcba06dde2cef49153c45f0cef40959d729852634832bc

Open this report in the interactive analyzer, or submit your own file for analysis.