Malicious PDF — malware analysis report

Static analysis result for SHA-256 857e66d784019087…

MALICIOUS

PDF

79.8 KB Created: 2021-07-20 09:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bb24d5f44504afe5081fce303758e5a SHA-1: 175ad78037090766c353a99b3a94fbb9fe43e611 SHA-256: 857e66d784019087c34c3a81ce776ecd685fb5c121aad566d8e1d261a3736374
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a phishing campaign. The embedded JavaScript is likely used to exploit PDF vulnerabilities or redirect the user to malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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.
  • 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://dongshengcable.com/images/upload/File/93690597141.pdf In PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100924.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d77030c8cfd---8140988672.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be25169632f---fibazigetowoxono.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/vovukodunejixefas.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93077cd4ca---kulixe.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/resalezibumikozuk.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24033af4bf---57931614824.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08bcc392a---dugofaxugovukubev.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45b750967---13719432594.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91090762951.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6dab6815---84680827497.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/30008785308.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/webozuxudemigibara.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/a3brgtn0j0h8dqa7lajdk5b2j7/tovedob.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076b261b3c93---zisuwupilurek.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/gilegagifaxoxigotaruvizew.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/9l2gsrrbvp4lvctlps14dtg3cq/49936132212.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/072b556f4c30306d59e16129d7caf3aa/20260036382.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d1c3be105---92759888094.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073efd45d4f3---13112051538.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/60032145494.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1943d447dc---47346845721.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cd95fc88e1e012a13c63283049b36d4e/31597402183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=code+word+for+hPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16272 bytes
SHA-256: d9fd2578dddad7a6650f7a98bebf4646df8ab651c4007856c32a52f59ef100ef