Malicious PDF — malware analysis report

Static analysis result for SHA-256 510855bc3e6a10ac…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 12:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6fa8cfd90e9aa6de02515077044068ce SHA-1: 1a04f85f0c6123995a92f8e051c94ad8d507e7ff SHA-256: 510855bc3e6a10acad8931dc6c8a2b3a7a9af9599042c28fd98575c3a5a99fb6
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ClamAV detection and heuristic firings indicate this PDF is designed to redirect users to malicious content, likely for phishing or to download further malware. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a104b73eb671672014e60abcea331dbd/54858700560.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/xuvik.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/namivu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847d3980ce4---34947962201.pdfIn PDF document text
    • http://unseretochter.ch/images/file/bazitepazoxekixuvunuvo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/tkv4s6b5ogk699p5ki8l2076qo/kiwofudinufewujoluxuvixal.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f029cf6f1---weloruzogorusufuvene.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nawuxufubavuluzinusasurab.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b905d5055d---63519460963.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7amvl62b2snbdirv9s7en6d203/dobufota.pdfIn PDF document text
    • http://gibisch.com/files/files/60885672319.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/eb6731db98762e0c0631f9adb329261d/35320695254.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b58917026---bufajurilaxavodota.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11c14ab21---kojedikajopavakewidile.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tefapexonunowavugeman.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7625682f---78639454308.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/romad.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/28119401806.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085096598318---vozezamadosapotikutu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16121c2de1a153---2779805861.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nlpu2tvsbdqkagsiiedf1hag62/gofuporuwomogazoridaxire.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210619015749.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6cca13ba---fabejaxokexekomujinajil.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/birumeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=application+form+pdf+jobPDF 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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 10732 bytes
SHA-256: 0629abd93b57ffd2fd2ce50ae5d4a9e218bb3061d1f9242de2f749a05c9837a7
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1