Malicious PDF — malware analysis report

Static analysis result for SHA-256 0053ab6f48d20c4e…

MALICIOUS

PDF

74.2 KB Created: 2021-10-05 05:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 059f187761149b0210d23c0748062aa0 SHA-1: bdfce7ea708ab15a19df3385c060d79e8528ac0c SHA-256: 0053ab6f48d20c4e9f53bdfa29c227c98e2919ea6639a15d212c5316ac4a7e94
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://webbuilders.com/files/file/90420624640.pdf In PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/gozuze.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/bitiwuke.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b2c3034c---puridipe.pdfIn PDF document text
    • http://metabolit.ru/files/file/59023473580.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/8fa2c14d4e80f4eb24c2dfd28c454e7a/jumogun.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/kubegopakiko.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/df74cf05d87ca9338877295fe81cfd9c/6366353930.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/95669388208.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/nabovifepelobepur.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16141077d9bd13---28771582706.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/17360370691.pdfIn PDF document text
    • http://sunway.me/uploads/file/240047072352.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/22486463420.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/suganu.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/zaledixitekivebumuxeb.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dadizotafogufuloriga.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/188559070.pdfIn PDF document text
    • https://negaratoto.com/contents/files/lexis.pdfIn PDF document text
    • http://tochuchoinghi.org/files/51642341262.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/41321550198.pdfIn PDF document text
    • http://kodemari.info/data/files/xiwafebivodoribokegovuz.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/fefozaxuzenodokasafo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682b5aa7a3---65289206534.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/16416599380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mechanics+of+materials+8th+edition+solution+manual+pdfPDF link annotation
    • 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_off0000ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4D 11188 bytes
SHA-256: 4337551b24a5f443d98d1cc510fb5e11f38e248ab3cd77f873b17e7e11e43d8f
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 17844 bytes
SHA-256: 05dc67a8a023f73f7b52447aa6c93c32f9eaa1e8e17e8cfd1fa4da1b9bb82b68

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