Malicious PDF — malware analysis report

Static analysis result for SHA-256 65931830c721cff8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 18:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f54d37725066fa8d5ff223495bd0013c SHA-1: 26727fa5b72db6b97f028e02a933a3f9a80fa30d SHA-256: 65931830c721cff828e2c21050dde90349b15cd8a4fe92b7e6ee0c42f3fa50c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a8fc92678fa296f44b8db6f339bea33b/doxetikizekesasu.pdf In PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/84582564811.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/28309696428.pdfIn PDF document text
    • http://cy2hand.com/userfiles/88136598955.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6793878874---27085205161.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/b3snkv5i5n47n2t4sheo6tu653/13610288475.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bexas.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/13025686904.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/e8efed6821684a13fa3ebed8429660c8/68392739089.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/78504727727.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/85238948204.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a09c7f26938---rarimovokiberokexazadoxoz.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/483113a2b425bed20bd062699fdd9e3f/mapekofedij.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9d4209967c24f0982d70d4bf63ce4c79/xawezomab.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/25864099007.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ec092d5f0ef51511ffe35d55f3e7405d/18752626393.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/womegesukapejajovixoweri.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/27359935479.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/27051898954.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/laguwafowudezedigupu.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/96173394434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=aadhaar+card+pdf+password+hintPDF 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_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 18184 bytes
SHA-256: 65c726a48e35d26abea721699f6a9250991c873943ee91ad5c13ef01bb5ce7df
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10608 bytes
SHA-256: 09912337275275ca4e1e153372e2fffd0633203d1e0468d7de506379288baabf

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