Malicious PDF — malware analysis report

Static analysis result for SHA-256 2931a171fa0ba77b…

MALICIOUS

PDF

58.1 KB Created: 2021-09-26 05:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cec1bba437c988ea41b8f4308b9f2c2b SHA-1: 3430dddff0c23d7168e8e798b004f231b6d91555 SHA-256: 2931a171fa0ba77b5772598ddc1839dc83f2a13a16a9f614e3e31b178418af0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7077

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://adamlegal.com/userfiles/file/gedegefidanogulosuzo.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d5807320c79273a00e239c6edd561a24/lubukafukaduzibupobogelin.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/42238875615.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fubanonufarip.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mcvftp3f5b0154k4068cquqrh6/zezato.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d46e9dd6e7c7b50a9231d96bf4ed80e1/33042792337.pdfIn PDF document text
    • https://htmlpanda.rockeit.com/userfiles/file/jimelawuwisetujol.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_091101.pdfIn PDF document text
    • https://bunianco.com/other_files/File/lademogo.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/77284352366.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/pozodok.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910120259.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/10025997842.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210912_DA3B634127D26844.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/jisemimaj.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cb38a11585d8ca036a935c36e01c3318/56400513418.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/vazadugifeluludukux.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fowixuworakemujit.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb6fd860e---duwotokenewezok.pdfIn PDF document text
    • https://umartravel.com/files/juter.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad4c954b9e---21958666014.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/2578921128.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/bolera.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/10aee520e94b1c37ab2b7047257c3aa4/vanejaduxiwanetopata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+many+days+can+raw+chicken+stay+in+the+fridgePDF 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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 11160 bytes
SHA-256: f59e22f20329b1dc7824128402beb92ade72969ef277b0d25375585f601a39a6
font_01_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1