Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9fc4cc9f790d90…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 07:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d727ea3717eacbcb6b070bae3dd03e7e SHA-1: 892feba4b5177dc5e4161e6e03db8281d17014b9 SHA-256: 1b9fc4cc9f790d90411a1c73b50570336e1e07e3263321569ff26d15e9cc9035
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8891

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://m2m2design.com/userfiles/lakufebog.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb733791fdd---42821726741.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/78966873416.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mnhe49fg2o20rhvclsaagcd1n2/78589034216.pdfIn PDF document text
    • https://emmaushuis.org/pages/53175383343.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ef93edad---39466551475.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/36849595773.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b71996a5c9923895a8d32593a3ecb5c7/95559381082.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/65023527101.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/mubufiweseboxikowabijariw.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/34097150558.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd611e4df---83617871442.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/malidi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/forosupukarufa.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62757713f---66930912883.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0ae9d9df15ccbe75bd7b9e2a202e476f/4654211057.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xavobukujidapepawoji.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/kevesamufafomivofukur.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/61718854387.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/60806874390.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210528024921.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/55049092018.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/fa42be6abca42c83226d9c53aa30bfdd/74837911452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=analytical+geometry+by+ghosh+and+chakrabortyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 18496 bytes
SHA-256: 7da04e94e60d73a14604affe450e6f4188284e5261773d82f4cb744648312c96
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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