Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae91b9f78553349b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 11:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1dab9a8f6c11a4499ad1a4429b52df9a SHA-1: e7664a51f4d9db2cd84fbb1e3fca30ae23e100bf SHA-256: ae91b9f78553349bd57fdc6b5c5b6e29d956acbd4f2bfd29ff9d828765f1f731
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=root+paranoid+android PDF link annotation
    • http://constantemail.com/userfiles/file/1630778858napepuxetutotox.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/97763652483.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70bb2a2f7---26187892755.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/75663507031.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/59807110985.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/48495097897.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/38igcrkhlaut2qg22dti2ip2b5/barebefamuk.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/11189170716.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f7d45a2a---levezadani.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/65222766223.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210905_B05334591F2DD14F.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/rizefitupafotod.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/38366575337.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/42444199237.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c376cbeb7---63104159969.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/40079466961.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ede42d8b2---tewukawifedoxipor.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/gemov.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nasal.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/texoposogusoxes.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/2028025758.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16134d0a360081---bosegibemalob.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/50574150714.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/gibubugajogimazifajejuxob.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/73837271197.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328a72dab70---42467155672.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 17688 bytes
SHA-256: 84d61eedb30964a2737ffc60092d7ffc405b0ab254cc35bdabddc13670cf2059
font_01_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 10084 bytes
SHA-256: 0b6c269168066faa986688f3354e467fc33c88d21b7ab6f93b814c80b054ab5c
font_02_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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