Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a601f64d6dc313…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 20:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14ca35231bcae1c4c9528375d144b449 SHA-1: 209dc456333d5621f3a79bd586632881e5c615d4 SHA-256: 76a601f64d6dc3131e941d20b88dacc4f7ea7e2acdaa74f6843e68eb765b4f2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, with several pointing to compromised WordPress upload storage. The presence of these links suggests the document is designed to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=cider+emulator+for+android PDF link annotation
    • https://birudongker.com/contents/files/74811017542.pdfIn PDF document text
    • http://ctm.it/userfiles/file/44301056999.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd5d4dcfb---34463527668.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/laxakodejatexikemebe.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/82849989896.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/gozololipobexotud.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3f28057---sugosekokikado.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/sojokukagevabarugepifa.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/zugijobi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345beb3f8f6---vubenuwigaxenutat.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/kaburubaxokutola.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/53326001861.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/57707695420.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/36577991504.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c252d69a9---gudufuwurododegus.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/lewabetusaje.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/nepotidebegutij.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7632752d---8689918888.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/16899107217.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/78637110788.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8c87f025caec16da56406626497e36bc/24087388538.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131a5fa7ad02---wipexarakebukajekazixoguw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10476 bytes
SHA-256: 376fb7d05714704ac3b0c2b12317fc362ae385b3006cefb7fb6e9f043ad07b64

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