Malicious PDF — malware analysis report

Static analysis result for SHA-256 b112c8642e23e284…

MALICIOUS

PDF

84.5 KB Created: 2021-08-01 05:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ed698e5038e064dc963f1bfce2199fa SHA-1: 91cd04ad74e05414b495b34b31b3e52d9b120e8a SHA-256: b112c8642e23e284bbb4348fee3ee043a76bbd61a287590da4e2c27510d096e8
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting the document's primary purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9045

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://rbtyutj01.com/userfiles/files/bukajabilere.pdf In PDF document text
    • http://nessium.fr/userfiles/file/matuzosorakagigax.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/aedjnqvmq2gfkjtmgmmg8sj7at/zuxadimisiz.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3a5a8c201923dc1b78804637225e87c/46879065008.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fivoberawefododezozuwom.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/23915160031.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/6520487712.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/8054536585.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/belerolazepafi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075de45c32fa---zatizaguligokekut.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1bddd85e7977d20230c0829bae8bcd84/nimuzededonodira.pdfIn PDF document text
    • https://jin-ji.com/upload/files/nobomunakajiwulumovu.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/314093967.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e7a8bb254ad4437a9a013ffd6336233d/95729698083.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fe151009dc0---nigumorotadatesilekiros.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/67428176792.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2a2d887a---96348798259.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/11096896623.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hl9aqes2v6bf81rs6ltdc6ddir/61619169279.pdfIn PDF document text
    • https://seikico.net/img-tym/files/11027802526.pdfIn PDF document text
    • http://chromavials.com/d/files/xovibivilufevukusev.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2adeccfbf883f2d279135221653f63c2/81717613203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=business+management+textbook+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 17044 bytes
SHA-256: 7b6492d4b4ac4fd98b5e4492e46f05229a6c3a0aa70c27e4ef76793f32d543e1
font_02_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 10980 bytes
SHA-256: 95c845c6fc7feefee5cc2e0feef1d551f5b4ca4b880bd7bd8a5221456d23e9b5

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