Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d3be6f6888f7f5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 13:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 63f52e7474da536fc3ff4dc2a7e29b83 SHA-1: 3fdb5b1febf22a54b564a1f6a6c736e7c25c4efa SHA-256: 47d3be6f6888f7f57a300d898b0b29b4c89012f42ea98cbe05a22aa3b2427373
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or other potentially malicious hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware-distributing sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5327

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://contrast.no/ckfinder/userfiles/files/92623999228.pdf In PDF document text
    • http://computerdoki.hu/user/file/93977796368.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/8398305911.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3a632ba0---piganupup.pdfIn PDF document text
    • http://charontrade.hu/data/file/vixawakodasixawoxokatojon.pdfIn PDF document text
    • http://standardamulet.com/files/files/134326892.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/33327897958.pdfIn PDF document text
    • http://topstec.com/d/files/70803685887.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kipesux.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/77617439325.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/67427374833.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gazuxogot.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/33972659314.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/65574492793.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zopitanesi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134faabb9b21---56828843428.pdfIn PDF document text
    • http://hueide.com/upload/files/63148622372.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/13830456982.pdfIn PDF document text
    • https://airbays.com/userfiles/file/netolegusulusaxitafugatab.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631300287.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1491ed1c---70606535002.pdfIn PDF document text
    • https://senfina.top/uploads/files/76591613767.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/33146457306.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/gonuwuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sao+2+episode+listPDF 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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 21568 bytes
SHA-256: b170dcdf4acbd277eba6a32e5731ff4f5b538f514ba45b49f22de790d8a165a5
font_01_sfnt_off0001234b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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