Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e60dd7974b2b3ff…

MALICIOUS

PDF

79.3 KB Created: 2021-09-01 22:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f785723e3596a2fbc52e5f7f263b273b SHA-1: a8e79087d91f685724405e88baaf86dd3ebe32d4 SHA-256: 4e60dd7974b2b3ff7d6c28575f5a0658d94e9fb1f560b5388aaa9ec585be5528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a redirection mechanism. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to lure users to external malicious resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/uplcv?utm_term=the+mirage+volcano+eruption+times PDF link annotation
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c509ceb0b---98233463142.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/03190d9066c89bfa0a70c678018241db/94993768215.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497824b15a---takuwemuwiximitugi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4493db04b4---koxudilataraxujuvi.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/37415564523.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/13f3552e818c3dab480edb4011279838/18652529945.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c268cb46f75---fufesokobelakazuzo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609846048bc2f---13449615157.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f130b00207d5f4f050ea35dff31accc2/jukokimofot.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/9304740282.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/30504712754.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/rexaxezu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1dd37de8---77065230756.pdfIn PDF document text
    • https://buyafranchise.org/files/files/1131173588.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081320335817669.pdfIn PDF document text
    • https://kenadong.com/contents/files/28638493467.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pazonawofaronula.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mumukalekowo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/44cf0a4a77beb53c0b39e4f99cb97ab8/vexazuzapekulozimo.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a8d3aff3---febuwumexatewu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/f5dbe95d1861fa9093c6d2f9b8a90131/tawasaxedilonelo.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/36519968696.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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 17588 bytes
SHA-256: 53fca372bab40d09856e98f99a3864bc1a7fecd4cae6fa2b0642b23e6150a2db
font_02_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10948 bytes
SHA-256: 031ddcf3b2400f986bd49bc5fa44f532b973358b126dc480f420a3e781b7e370

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