Malicious PDF — malware analysis report

Static analysis result for SHA-256 c860870fb10cf73d…

MALICIOUS

PDF

63.1 KB Created: 2021-09-21 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa1b720bba69f8a2c5a933d1ae129b6b SHA-1: a50f0de49918624b0ee439e229560d86bcaebdef SHA-256: c860870fb10cf73d2485bd3754712fa0112e3fa010155dbdbec3c38ee183bfda
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6536

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://franceplus.fr/userfiles/file/80275717021.pdf In PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/30333474030.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/xotonifozake.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85d96873---riregub.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/40567291775.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3248140fb---migekavilakosokutipejariv.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/72310170241.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/fexedebasedusivurareligav.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/42280863704.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/dekoverikumozage.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161467bd391700---30838467531.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/41753303794.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/41818509991.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109101018245392.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/75682795528.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wewutimirigo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad1727df2---31408630495.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b503b5aa---zunimutedojokezaxelugi.pdfIn PDF document text
    • https://avenue102.com/uploads/file/88779668645.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/wuxafirujituw.pdfIn PDF document text
    • http://chinahongji.com/d/files/gilavutoxelozowopon.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/91636944809.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/6519635669.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/xoforufamox.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/zuvekori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+drastic+ds+emulator+apk+fullPDF 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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 11060 bytes
SHA-256: a81f7d4bbde2b3936f96d6d485d3807e02b9f4e5fa8b63ec0b44c39d78252158