Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b28fcb527b87ba…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 22:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab49445486b9f1c46a1fdddbdc7f09e0 SHA-1: 0ed5a256bf1fc932762afde46afe97d75b699eb9 SHA-256: e5b28fcb527b87ba77b63cf59d1603f9949100cbc5953adfbaee37cd82071004
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to a variety of websites, many of which are hosted on compromised CMS platforms or appear to be disposable domains. This structure suggests the document is designed as a link farm to direct users to potentially malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=list+of+mythological+names PDF link annotation
    • http://gonzagafood.com/userfiles/files/18993047148.pdfIn PDF document text
    • http://protok.pro/upload/files/69976977001.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulafi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5f42f925---pujakuxezolifenukozanix.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/piwoliloxor.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/54294262726.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc529e8bd---1425370268.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac71612d4c---19409096221.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-08/images/files/64464815018.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/55309073789.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9tod15bc15ci576n16pi1vob8l/xulevipepowoma.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/34376488996.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614081e25e107---ziwegixawomanibugeviwip.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4967af546---19822518582.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/nufenigefe.pdfIn PDF document text
    • http://rongqichem.com/upload/files/pitifesil.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/zemilub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eebe8c6ba---35802556523.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/27931938336.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3aa08ff715f430ef8664669acd4e1345/lixonuvi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/pilixuxawenekidew.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/dumiju.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wifuvujopixolarik.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135cd03c4cc9---3777524244.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 10752 bytes
SHA-256: ef954a692bd16081ce71ba2ee729a1081b227d275e957aba167544ed0dcf1dbe
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 18316 bytes
SHA-256: b13b392ecf1de80b884cc4a2188a84a49be37982ff54f1d2bfd777b7813c58b9
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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