Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae355c6ebc037087…

MALICIOUS

PDF

54.6 KB Created: 2021-09-24 23:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f70847234769f0ba75dee923c6d2c443 SHA-1: 7e328c979b108865cbea3916484d75839bd3e459 SHA-256: ae355c6ebc03708709bcbdfbf9e73e034570089242d9c9d60e83fca759aaa41d
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8171

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://crewmak.ru/uplcv?utm_term=secure+vpn+apk+cracked PDF link annotation
    • http://arniestribu.com/campannas/file/kotodulolozusilu.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/48865647171.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140be188b0e5---92046713331.pdfIn PDF document text
    • https://zagi.hr/files/73386304046.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/gipafejopude.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/27917351535.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/65842684537.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/73051961450.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/dipuxefinodapelumij.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p36em9ab2pl2viqkge0sajmvj1/lekipupob.pdfIn PDF document text
    • http://reopen911.info/media/file/wibafafoxibopovisuwasite.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/30603001594.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/torope.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/kowira.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/sever.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8d5088a8930bd54b6893edc45c88b31f/89192555524.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/18351663126.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tk3do70qm4h0pcq3fdc7ftrhdf/pijijeje.pdfIn PDF document text
    • http://belovosushi.ru/files/renafajanewaxujojimeni.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/30885393034.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/siwaku.pdfIn PDF document text
    • http://preiss.at/upload_files/files/rozezukesimalujaf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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