Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4da6deb807589e0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 01:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc5055694c7232dff74f71dce491c8f9 SHA-1: 99f895b29c1456072bfcd538e76027dfae001483 SHA-256: f4da6deb807589e0865ca9b905e43235b31671b533eddfa940da108947fbcafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://philabc.ru/uplcv?utm_term=4+in+1+recorder+apk PDF link annotation
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gefolu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/24218179940.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/062321239562.pdfIn PDF document text
    • http://poiskvod.ru/images/file/75021840587.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/simik.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pinomowen.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6bb05af4---sodewamubulejitepitabeviv.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/xegisebegegobi.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vojirolasidej.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/jobevodesanimopagenegog.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2c9d95f48c97c25996b2f08ce04bc26d/43573932984.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/ripesoduzurageviso.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4fa51e4a164e5b5a6c774c333742ff35/tavewutix.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/wozolajaji.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/89021423285.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a0725120---muvavujizikerulezo.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/3855399409.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/41257072988.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/42069507075.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/28867912869.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 10320 bytes
SHA-256: 7dbc920ff90533cfa6979e2c53d805b2b488fa878b8399ddd53a1f1d4a3df286
font_01_sfnt_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 18256 bytes
SHA-256: 466cf4b654c938eef6c95d83ae390c49a7f212a9a3cfb046632ea8fd57fd3f42
font_02_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1