Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1faa1fa8a7211fe…

MALICIOUS

PDF

101.0 KB Created: 2021-08-02 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97bebcd673de9676d304dea419af6615 SHA-1: 428778cbae284618c6a5900757a0e19d0c146242 SHA-256: a1faa1fa8a7211fefb489ab87be738ea33d4401a08b3f90f68a737cec92ddcd7
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, directing users to numerous URLs hosted on compromised WordPress sites and disposable domains. The embedded URLs suggest an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=programme+musculation+prise+de+masse+maison PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42feea3f1c5ec73c4c3d376d1b7fbae3/pofamizabobubazudogomu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d827eb7e4c---46561255147.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc7344563---1838044834.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3428257288.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210723_35EACCA573B45AE9.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ad664731---wuferaxus.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/18169657828.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/xonanavuxupegupolosufeb.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/83629037504.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/73370eml9ffa4dk09bohdpt099/xuturemaj.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/50330044984.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd658d426---tenikowise.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4e734922---58189645186.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/80215978229.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/89vaa4hi1bmqiavddb592hc8p0/81706974821.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/28280860196.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/jakipolol.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/ripezujo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ac02e3f6c37675105b17594a2d491626/35713000495.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180a7a019a---figujuwufuza.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/17012136340.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6d577af32---nenuxuripaxatefatalaje.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_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 18796 bytes
SHA-256: 91110870d75172bcbf0d01666bbf53ac58583cf2bf56f414663f46ddb12d6f94
font_02_sfnt_off00016a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5D 10960 bytes
SHA-256: 7265eb2091b2c21c34950250152668ab7e8f8427805174d86cbc65acd35b921b

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