Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b05a52df326523…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 00:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f293de09a1ec31392d5877384d49fbfb SHA-1: 055b76b4ef0e28508c0a088c9c4cdf0700c8e674 SHA-256: 66b05a52df326523869a3b42da0c5833e771b530e620189baab7a8bf9afb64a6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment. The ML classifier also flagged the PDF as malicious. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7560

Heuristics 5

  • 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
  • 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://norilskgu.ru/userfiles/file/bawisarup.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/sanareru.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/venuodvk04v7vvhi45g5q0bc34/lijamukogojanevifepago.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/ninobevinifelunowegexo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nuleduxojudorabex.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd0b9aa42---depalukufowesabadanisuv.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d04f1c1bbed79ae80422ac11096e935c/fakulizuxobunetixekuzov.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4desqahiricideocg0dq0hmam3/mawobamexujuneg.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xemokev.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5781c43c---xovukirovetadikupa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82e1b54bf---xaxoxureborij.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/08/15/xagulone.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f04ebcbfb---wagedogosulobunavuvem.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/muzupulikomakabinafinib.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7a6c3b8c---rixuzabelanerakop.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/jiwupominasirima.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pozusuduwafodar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+split+a+pdf+into+multiple+files+previewPDF 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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10900 bytes
SHA-256: b2d2a607ad97757d0597cd35dd885caf54f7e2037b55e06e6e0d91b3446357d0

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