Malicious PDF — malware analysis report

Static analysis result for SHA-256 06317914b8215fe7…

MALICIOUS

PDF

62.3 KB Created: 2021-09-02 10:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2aaa9468e79b4cc392027220e3f396d8 SHA-1: 31b4d2d40565baf6e35735daf27b1e6f13f95c9e SHA-256: 06317914b8215fe7f427805c5217adcad626619b7ecfbf5de1a7ad80dced2e37
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and flagged by an ML classifier. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage. These elements suggest the document is designed to exploit users by directing them to potentially malicious content or downloads, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5198

Heuristics 6

  • 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
  • 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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c15f4ea52---nolujuronub.pdf In PDF document text
    • http://kiuanai.com/userfiles/file/14233520418.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611caf716e02f---55551704744.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/47776995170.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/nobidudumuxavazijavowevez.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dabomudosu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e37cbb74aa1c36be5609357235bce82b/22959232295.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41ae6c45c3c955168541361c4aebbc13/kulovo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/6408606d44ba81369937810cff621d03/depadoxik.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc79ce38d---bakid.pdfIn PDF document text
    • http://etnorom.hu/pictures/gepaji.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/59745357565.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/fabivevofa.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/vigapegabamesuzusapa.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef3249b62---16084366485.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072085885042---pogelekosepegobaja.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/23665239606.pdfIn PDF document text
    • https://cubic.is/userfiles/file/vatuwojojewevotu.pdfIn PDF document text
    • http://nccutrackandfieldnation.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/gomibasixele.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/xemezux.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/79360598337.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/72055649800.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/272214067.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ad153cace5d762d1f50d780aa69a8a64/dopelatewusegisa.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/gufutazujobofanodoxajaj.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/8382174691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=character+in+c%2B%2B+programmingPDF 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_off0000bb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9A 15128 bytes
SHA-256: 1839dfc887fd14eae399651bf6de2a68b24f0786a74725514092449a6bf1464a
font_01_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1