Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc40ea7b3bc0512…

MALICIOUS

PDF

62.3 KB Created: 2021-07-29 12:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25dfd4f28561461a03f01892668cbf88 SHA-1: 5c4cf7e117544e4496d404cf0f43b2ec1dfba570 SHA-256: cdc40ea7b3bc0512139d96417faff4828c3358ef71058c285a5952e4cf6fea14
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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 https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/5f226c3584383a8f9ef144f9745b8bda/70535962338.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d71cfb80---14091690386.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d643558aa9ce66d0a4d4427c589690cf/jewologelafosipi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/2huu0t0d6b35d9uj5n082aa0mv/22843480972.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/68933228154.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/369bea2e0f66ecb894e8f91558a30954/mebizolefejukirapala.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/52238700364.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/12d6559d2593b847ef3a1cb5a71a8b88/53451723398.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/tomerigenori.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e04df260---99828290667.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3cd307716bb88ad18303a91fcff0159d/82015693006.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5808960bb---99383717923.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160835e3566a00---xiwozajonaxozegika.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9160642af6ff8bf2d83f91022be10e3b/kigopoba.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b1b8ac23---9450715050.pdfIn PDF document text
    • http://abc-tel.ru/data/File/zegovamerojizul.pdfIn PDF document text
    • http://kasargod.net/uploads/file/76233460416.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2cc99f02a---paxegixujevegosez.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/liwineruzojigarixet.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed558eda4---vurenaxaniw.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/2800223995.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160876e9cdb3b5---41004118821.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/xawaxalas.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a057c4b5c---nuturuzurotejizivezemikan.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/titugawabuxub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=%C3%A9valuation+nombres+relatifs+cinqui%C3%A8mePDF link annotation
    • 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_off0000d06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06A 11104 bytes
SHA-256: 5be72493d31c63af5ac094e0fbb125759fbf23fb4b4a21fd894d6c31f98f4ca9