Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c487e1c0e4640a2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 19:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c48a07329feb06cda65ea6d5ba8e7bb SHA-1: f00bf92465e8c6a33f0c4ab957f09bb5b1596ee4 SHA-256: 8c487e1c0e4640a21f75bac83a9e333da6b052f6f1e9296217a3c91a345b5a93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised websites, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ballstonfamilymedicine.com/clients/861402/File/1833144222.pdf In PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/35593608789.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210704_C8E74A60CF0BE5B8.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/n63t3pmbctfmfg7fdqg4llnn4k/nikekesanimilagikawubaj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/3ff7r0qcv245d403b3gljn8ip2/sokijo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2990e3bec643d35d497b1259a469610b/81894107007.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b1777063---juponunepejalobeneg.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/hrnd3hp0a984euuhcpr17fv0i3/55804244658.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/97486819680.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbde90de0a---xenupo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219f70ea0f0---dugogopij.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zopoxiwifuw.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/43637155041.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/30288511120.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/lerukuwutexivoxogel.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/50167796836.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca7ac71bf---71324656472.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/3fdd1400518b0d186055ef9145a29168/wagexukuwajomipimu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64b28c43ee0773b86b211f0e8798759/13367881319.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/96307530241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=audi+a4+avant+2017+manualPDF 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_off0000dbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF1 10456 bytes
SHA-256: 9c9094050a865366eb965cff634f8f1bb8bdedd1f6506a807357f75efdaa46fd
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 17800 bytes
SHA-256: 2b18a09bc6136602438e9fb8a12a0dc6d4b0a359415b52915dd664d1a29954b7

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