Malicious PDF — malware analysis report

Static analysis result for SHA-256 de14ccfda4eb30f9…

MALICIOUS

PDF

108.1 KB Created: 2021-08-20 04:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b490f79cdd7904d830c0f30441417fdc SHA-1: 516b15ba486a778b79c643b41e3f65a8052bc808 SHA-256: de14ccfda4eb30f9288ef343a4e243105dfac20f430fd63f6a71e9a0d9d94131
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is often used to create documents that exploit PDF vulnerabilities or serve as lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3109

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 http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tfuvtacdukuuuq64tednh4gb26/71714865616.pdf In PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/taxasutad.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/42689376055.pdfIn PDF document text
    • http://cabini.it/userfiles/files/78170289054.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/45849578953.pdfIn PDF document text
    • http://asfalon.com/__files/file/zezixurofijegipik.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/pexogajipiwupotarafuvem.pdfIn PDF document text
    • http://slsnn.ru/content/file/fulaxokovakukomopi.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/fusudelet.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3ff99389dc70742eecf76155786f29d6/gasabivodoso.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/71104398339.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e4ac9971d---26938388898.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/68bcc7fgu2echsuoge0m7aj2a3/fakozusimuwemokape.pdfIn PDF document text
    • http://mid-europe-ex.com/65911736150.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/tuladejuvagaxeg.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/62295bb007aa882a3d9f8494f5eb85e9/xelir.pdfIn PDF document text
    • https://aashianarealty.com/file/nizabusorevobotap.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/tikanadularozigob.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a721d697dc4---11722359946.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/6142615521.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c34ad986---vufifoxozerajijivo.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/girorugulexulugovikopog.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/99c427e3869b60521f6cb6cde0c7db86/16140040159.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7283ov7evnlk1do0pobs0fjbo7/topusepipowidutipejamu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b600ccb4bd1---wosejejipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=karek%C3%B6k+ayt+matematik+1.+kitap+pdfPDF 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_off00015129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16940 10748 bytes
SHA-256: a8743cd807fd14193af7701e2f3b3c3b2748e5115df8c657a309f76681ff6738
font_02_sfnt_off000181fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FE 16848 bytes
SHA-256: 9c6981cf3606793a2afc09d844369a669a650a0d92182542a238ac1a0030cc03