Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff321bd733349164…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 13:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee3cba71bab59a0eb984cb1fe3ac2744 SHA-1: 98ef9e1a7dfa0094f587ea39457555008a8cf9e2 SHA-256: ff321bd733349164f13ee5eb76af8bece57fc9bb5da4ba4be13b124ffe2d95c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=el+centralismo+en+mexico+pdf PDF link annotation
    • http://christopherspubandgrille.com/userfiles/files/kosunuwe.pdfIn PDF document text
    • https://zzhqhi.com/d/files/runafoni.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/40326916482.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zaredezerobotetubodalamiw.pdfIn PDF document text
    • http://intergeored.com/upload/File/dazipimupugunudorurupa.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/gubukatoferalila.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/solixugu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c42486b9b17---dijojini.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/87262503926.pdfIn PDF document text
    • http://sieuthibds.net/images/files/dovitewuwawutililutus.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7108cf7c9090ce41ccaa8ca88260003e/56141769909.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021080700360273499.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/zisovajukumutadenatus.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e381f3a6c5c2fb67e126a6abf5ae5e0b/vetubaxedoderefasopunewuz.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/poxobol.pdfIn PDF document text
    • http://risme.vn/files/58916243289.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/83485643408.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/34003827364.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/xifadujotaxoxedifelen.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/3579578536.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160837ca7438d2---vagobixezuvobiw.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/19150384800.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb11000833---wedudogoxabonifoteze.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/luseb.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d9daf75b48c419023532f717042425b2/73705968377.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_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10868 bytes
SHA-256: 690075e67cadd2ef5362cfdc1821f2e26b330f0cb632f182c75c298cf7f84473
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 17688 bytes
SHA-256: 225659b59b8a947f570023cb45a4db20df9b42efba98d4e89f7624f76d7e1cee

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