Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf9474263aa884a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-16 00:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50495452d084e6a568be287c82ee4be1 SHA-1: 96c45a2f6b337d703fd92f726121441d3ff7d47d SHA-256: 2cf9474263aa884a6a3a21a555d48bcd5f0a6239ae60a4aff2f5176c295ff8f0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/ubofdrbmehu9kgtv18trpbug25/45889507332.pdf In PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/rumisozuw.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/23051399530.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb960f710---bisadawipejiwo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7480a7de4---gitomorinimimi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd9b9dafc---58468408187.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/22192156620.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e5512bb1d6041f37cdf70bb2bbb9c324/34028057812.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/gosorudejolerav.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/bviai7k1pqv60jb1u77281juo4/bizove.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60477d112---14835638406.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/kumalukajavidufopiwaf.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/sajofasarimoletatirolu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944e164c20c---vugotodesujenimisik.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e0d7efc603b792570dca4af0a61155a3/lokumiruxe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ea88c38c---81147033370.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/nogarizezoneva.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/wogoratirolubivuxu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ttai0iqltd55vqlbhjhu2aka5/90909340151.pdfIn PDF document text
    • http://seamacros.com/upload/file/wemefaruso.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d6b6547c1819d60c5a44f650524882e1/75835349488.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/pudupubujejow.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a62ff4f3e1dd2a35af1bcb76b6edbb95/44848004722.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f978100d9---mifivarewugugaxofozen.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086146325e25---49634526543.pdfIn PDF document text
    • https://yellowstonewildlife.com/razudozulinofidokimefub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=amal+clooney+officePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 16748 bytes
SHA-256: 6f11a85ebbb8c162b24e1926c267aa8b03aca5056367f3045ee121d70da1d6ff
font_01_sfnt_off00012860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 10224 bytes
SHA-256: 7f87afe4e3fd033f20aa42ba779b72722abe8bd47feb58ebf343a5262e6e07f1
font_02_sfnt_off00013f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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