Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f25634d1611469…

MALICIOUS

PDF

76.2 KB Created: 2021-08-20 06:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d255b9efabc0b2f3774cb6936d256abb SHA-1: 7b5c7c68c2a226da6f51f87dc21570225b36ecd9 SHA-256: c0f25634d16114690e7f5139f5c54ccffc2556843c2a73eef5a610bd064412da
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by multiple heuristics as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the prevalence of suspicious links is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9559

Heuristics 5

  • 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.
  • 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://mfdesign.hu/files/file/wuzanoba.pdf In PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cd596de01eil6tcfh64p4jmeqm/58802945157.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/bcc78a28a3a480baedd136173f91a58d/96983624481.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/21178278895.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/l472i9qhmhb2i23ki62av60p8r/10951043508.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/76714781949.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/mepakogesakasokugabapid.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sufatumedetefapatiser.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/61996293085.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eccd47145---50466269468.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/joruboradutozunolopanu.pdfIn PDF document text
    • https://inncredel.com/uploads/98322903920.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/p6hlrfv0fia2k657i2lj3d9fr3/vejimud.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160837c1a1b602---80294266656.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/61400869466.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/samojunedizo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/82121715352.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/9332411317.pdfIn PDF document text
    • http://change4best.ru/upload/file/rivefazanirarejapubiwav.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jitive.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/70048241370.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/97960996408.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/kukiruwejelivikivijeval.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f6667fc5b4a---gaxutaxaseweninexapot.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nuxagobuviwotixaketuterun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=hp+qualcomm+atheros+qcwb335+driver+windows+7PDF link annotation
    • 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_off0000e091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 11664 bytes
SHA-256: de431ade599868b60411e7d29f3fcfd3345b0d51d9a022485d576ea3d18323b6
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1