Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf91afbd90650425…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 12:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a26dc033e8e33d10c2e509abeb417db SHA-1: 94e2adf4246bf7bad684efac6576b6fd00d958d1 SHA-256: bf91afbd90650425f7969bff2c2574abcaac18c2b0fc0104ec5ed1080ff5ffdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=my+god+is+a+great+big+god+lyrics+and+actions PDF link annotation
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ecas6l67kour8qld0o4hrndh54/bexufomameve.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/pamasisaxigazimojowa.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/93214557382.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/24816265820.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/36659024483.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/72577079935.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kedomajemepukev.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611319dd81d33---bekugapuronenigolisu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/kufadimi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb15c7fed---8310722120.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5rq9f2v9bhrlm1mbl4leu395j9/31417542163.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1efb6a33b6531dd5955bd2cced26211d/gutekajis.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35550383323.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161117e55bc3ab---gewulelo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb6667c40---84496196327.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u1k3693qp27jqt772bvfkfdtq1/bedinagilokasakure.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/17442852810.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/90556044208.pdfIn PDF document text
    • http://checopharma.com/upload/files/86910990853.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0811/c377748004e2e729e5b5db6b02d2c13d.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1852b608f8c083bb7ead29759ce533ee/25429027666.pdfIn PDF document text
    • http://metallpress.ru/files/raletewiduwixati.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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 17304 bytes
SHA-256: 967adf5a0ea8825fd3fc1ebd1368716eea6bbf4cc3d4a44014991aaa7256a399
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CE 10792 bytes
SHA-256: 89d93375ddeb8330841eba09cf4c4f11c14ce1e8ed8a57590a8cdab2a601ba36

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