Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fae0dfe8b61f2fc…

MALICIOUS

PDF

193.0 KB Created: 2021-07-21 22:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a37e8e24369c31c9d2ca4a58cf869be2 SHA-1: 19fe072adfc177412c23746d3837a68d0de53342 SHA-256: 4fae0dfe8b61f2fc9e2eab0a9acf0f394dc1129112cd23b71d53e7066a47748d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7a930dcde37b9b8ea2ffc605710094f7/pizulomajediminevi.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079420aab6c5---72057212031.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/relevovoxibolo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3ced7d7a5e23abb24078e6850a27726c/754172714.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/65445224017.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9a2853c61b24e92c6bbaf3d9a009582a/sezilurovexadig.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/sexepesovodavabixitu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b25a80b29---20383024198.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/tizuduxekewizigofone.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4a9112c3e3cd16ebef0db6492aa7efca/kemok.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bawitekoxuwejusuf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bfc62264bb94539acf90003158ce233/bowuzedulodezu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f5a4c831---70401719403.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082080c18e44---retekanuturikimegejomida.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bacr5fjiuhf2f2s1mk8tsh7agc/72474795005.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5c0911a5f9eed0b4cab82ed1d87c1fa9/mexebutilerixurepubeguvu.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/311d0f1a1f30c424a1d20d2df455644b/tufoke.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/68140278941.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c384311c42d---fidadimowoxi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/266c6ccac7fa34cd0020956556dc5993/89068463661.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tot6ndp7th055rb5pf2h0jst19/16072447504.pdfIn PDF document text
    • https://airbays.com/userfiles/file/gumopaneka.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/85999092574.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c113eb0308e---43465074255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jesus+predicts+his+death+a+second+timePDF 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_off000283f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x283F4 10824 bytes
SHA-256: 583608ed981fb82a1eeb25ff6c7f814bcbbfe26f765bb350cb6776d1a57e4dc6
font_01_sfnt_off00029cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CBE 29656 bytes
SHA-256: bb0bdaa2bcaa1bd15e9bf1acba52c6c199d0dfbba274a1c0acc1bccd84004c96
font_02_sfnt_off0002dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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