Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37797e46bf1a877…

MALICIOUS

PDF

105.0 KB Created: 2021-06-28 15:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bf67cfa3f969bdb9ca57c419958b30ce SHA-1: 2e35acf1b8cd0ae7c4b6a6ae566ac3ffe759667f SHA-256: e37797e46bf1a8772c760a3f2656dd953b1c7af703c4cc566af96b95ed2fa364
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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
  • 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 http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f520938cf---78042785853.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i3fr0g0186087ufg3f1ih5afl4/61319210574.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb97604607e---subepabimafarixipodagu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/verabosopog.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/9297f1f035b94d929bdb3229e7123ab6/89974894444.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/somexem.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29ddee297---gabidokoviji.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3j48pdmjrtb1s9uldfe8i2rofr/puxadiposit.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088a6255c1be---kolepabefumuno.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/99264183882.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/tufejibupofinovoxirew.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea2ceaec2---34201852574.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/bexaneberorule.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/91714192058.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4e7c581e00ea10961e78709f18b2d740/bonirikobusevufu.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jixiburemol.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778565d51b---55362096676.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870de69b52b---savuluzodokufejofapog.pdfIn PDF document text
    • http://chieucoingason.vn/files/gufutasewixes.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabb104d1e---ditokelotadowasibum.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210613225737.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/kudadinekitezoluzifudin.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/timibanawexusojabe.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/fiwejebuwiwifisaxomagad.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099d33b7b6d4---tokepilovuv.pdfIn PDF document text
    • https://service-panev.com/userfiles/xepip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=land+surrounded+by+water+is+calledPDF 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_off00013595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13595 18796 bytes
SHA-256: aabf953a8fb15463005bed0136c03c7150d0c1f76a3af16b97d057e8b7d8c3fe
font_01_sfnt_off0001659c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1659C 10760 bytes
SHA-256: c0966f1f5730b3893976bafaee7d18400979aa4032ad1327a2988c2d80c85f99
font_02_sfnt_off00017e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1