Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc0cc970de2a01…

MALICIOUS

PDF

62.3 KB Created: 2021-08-24 22:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47053a054d5c614a0d73ba04bd8b8e17 SHA-1: 673a59de868806985dfcc859d2e39fa8fc35d31a SHA-256: 23dc0cc970de2a01db67fca11edd67bdb8a31bf830955d9df8e85cc7e9379021
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 compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the use of compromised hosting, points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9463

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://prmakeup.com/Image/files/fuxinitil.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074fddbdc493---soruzuxojojipuzalefujebu.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210623_E9162C8CA34E14AE.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/46451773730.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f10400a75---50582148016.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822e98e104e---31467524288.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502070425_1063025093.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1f2fc9d4ddd6d2d87fe22f1c61c7e1ff/88118658250.pdfIn PDF document text
    • http://recviem.ru/img/upload/19514681319.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/leruvedagubo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/698300e38f13d4a40b14780f44e08e3c/xegositowosuzo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c89a2be49---fepumasadevokefupoxop.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/21ee8be0ef8ceba6e72c8aad849ecc03/29028700392.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430062432553542.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/vopanofurafosugojisiwawe.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/witebi.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/4369367020.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5jdqio6g9uhefm1f6mrqp81bd4/46072526951.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/sugejeko.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/36672989446.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/60271884110.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611935c9305d6---59565152729.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/258a2fcb43f8e6efa4998f336e82c98d/98480532267.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c45e781fc4---gonaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ultimate+spider+man+s1+ep1PDF 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_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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