Malicious PDF — malware analysis report

Static analysis result for SHA-256 561b68514f5eb3cd…

MALICIOUS

PDF

86.1 KB Created: 2021-08-18 03:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7fb43c04e8b328d1513febd312ae35f0 SHA-1: a27e75b95cb0c92a2d7c588fe6aa530498661469 SHA-256: 561b68514f5eb3cdf49f938ad89b491bf9ea07a8dcc6c44d35622b4b26da7eec
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.8565

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/35827664642.pdf In PDF document text
    • http://parquet-cortes.fr/data/Files/koxofanawivoroji.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085504dad6cb---33967256142.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/pewapezimizajowivitewaju.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/27485506669.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3e8b843a3---gureparesipux.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/76098315189.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1d0s1sm6iqmqfumgd31m1adun0/57773825935.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ladadoda.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/39530423533.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/jepowojazipegevaloneg.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba1f354ff---dinamowipojivulu.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/duzilumodizebinevosudi.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/25867959.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/68077678162.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/29498290803.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/6471128118.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/54171142424.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/veridesar.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/pususep.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wanozovun.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/7mbfdrvvelr5ht48f9n3qpekuo/31827359631.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/8605093670.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/radaxomozov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fundamentals+of+differential+equations+9th+edition+sladerPDF 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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 11008 bytes
SHA-256: cb440718ea4d32719527d41194b4a7077d210910464de3dd8f1023aaca78c70f
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 18132 bytes
SHA-256: e0676ba12cf9b97ae1316edb1a1242f30ae2378bd332921dbe2dd123950fbcd4
font_02_sfnt_off00013dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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