Malicious PDF — malware analysis report

Static analysis result for SHA-256 b786d6b7af07619e…

MALICIOUS

PDF

64.0 KB Created: 2021-09-07 23:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc177ad1c970af49e1b9e98679f7c176 SHA-1: 653d0b81cf4b7a0f3107cc8dff5abec94b0cbc12 SHA-256: b786d6b7af07619edd2cd38b38125d49574fd5f30ee4c0a96aa001855ff0daa0
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis suggest a tactic of using a link farm to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8385

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 http://labonscafe.com/userfiles/61094802932.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9arsbdkf9omj7o2qtu6a91oc97/tewotibazovobax.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fogozuxefivuwi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/fupero.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/77661057451.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/vedikogaberaz.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/17da6c73f3dd1e07ff08735911ca2371/28585457903.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/16020980173.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087130ff389c---52280534382.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/lixegebamexuz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/88242a513042e2937e4ba2a69ed81766/16398958238.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pugiladosiwogobewa.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/83344769824.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gezufebiliw.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/27147967636.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/80615275516.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/87141849988.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/xawabopunimogud.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wujisepisafegediwifav.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071532b4b6f0---25206187053.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088187fc87a1---9832851701.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f7db0c6dd54---36203757857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=jipmer+previous+year+question+paper+2017+pdfPDF link annotation
    • 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_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 18004 bytes
SHA-256: ad61a4d9fbc46675f8d5cf1240e29aed900a1a7fd3c209a20236a8f8db7b1643

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