Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d64f15ab8a3de6c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 18:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ce06910c76c2cdfd4cc0fc478d44a1c SHA-1: 0b7597477b4638172396f4a2eee9ebab352d2c19 SHA-256: 8d64f15ab8a3de6c329e0ae8ea589d57bde704c45be473c28780d5ed91ff5f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=terminating+and+non+terminating+rational+numbers+worksheet PDF link annotation
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0578e448b---17871750843.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71736868042.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/87118854849.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/31728587963.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/73631756041.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608481815795a---89824391895.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a724f918946---17469239676.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/89899924636.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/45515758348.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/badimofoz.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca0d84028bb386380faeb45a8d32b5c8/52003382581.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105250833348881.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/97120687341.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/48779468850.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/xozabawamejevanokofowidu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kovadu.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/gukukelodakoz.pdfIn PDF document text
    • http://decalvanphong.com/img_duhoc/files/guzajuxirev.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/14367050070.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wamafibagugegugavuxuxa.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/99407331114.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/fudasuwozenipimamas.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1m37mbv9sp3l4nljo6ki4kjrg/59581892784.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/lemedenevumosokewijawef.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_off0000cbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 11076 bytes
SHA-256: dda5e4acce28e14e32e51c795f3bd583d910899e7ab40226407a8774a7c570d6
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 17924 bytes
SHA-256: e5504c200ce15eb44501937ee8fae7cb057d5a87dfd3f1c0c1a13ac77f988f00

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