Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2cfeddc685af75…

MALICIOUS

PDF

78.9 KB Created: 2021-06-15 18:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a363b73875320b744d2f361a5a016b81 SHA-1: 538cf7daa9afd745a50de9bf3b821d7a040b485f SHA-256: 8c2cfeddc685af75b86ca8797283d21a3f1c7883296587ae050398b5d635fd8a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7581

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://philabc.ru/uplcv?utm_term=launchers+that+support+gesture+navigation PDF link annotation
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/gm01bbffl5vu33n6tto2ojskqk/lexesuman.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf701930a1---pikukufejuxon.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160862cfb1b8cb---73668941546.pdfIn PDF document text
    • http://22743333.com/userfiles/files/4623609020.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/85980915853.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/92be19dfbce655e60b69c353b852c006/mazerorakidedik.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/34c59498b276eeb168a0d2abdbf57e6f/nagugogirezojodu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bixufenemeku.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803eab6f94e---pijifaxezi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b1aefd3c---61208955842.pdfIn PDF document text
    • http://chongros.com/userData/board/file/tusewotodapapofozijubeb.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/jm2pmtmu256ldt4s8k0o66ut9i/wakiwizodusipiwukiwivet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/723448031.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 5044 bytes
SHA-256: c383c3ab683cf627cef3321135cb7a06c0bb12fb17cbc18ccb64770ba9f57cf8
font_01_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 11112 bytes
SHA-256: 89e174e9c7a0170c8dbb9fc490719bd187285ad866e7eca0c124ba0652dea99a

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