Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38f1d4279a11c4f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 17:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d60d2c4931e521942c7413dde1d3da9 SHA-1: 0dc98a05cf169fde3790fb9c86d4f89420a5aba5 SHA-256: d38f1d4279a11c4f6ce5a9c6c8b923adaff36e738c97731fecf6874e24db4172
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and compromised CMS upload links strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eec4bb967a0d6a24415559c37f81e031/58785315860.pdf In PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/7678460715.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/mubomiwopizesi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/25651209235.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4219ac419.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcoc62e7cfrgfujd2vdc6inpp3/fawevomazerulitugupabiden.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/rozewiv.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/34136305953.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/48022443272.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161456a2da4692---69206845241.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/ganazapipulileru.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/52280971315.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d67010db616e5b013509fdd2cd09a51b/89521283554.pdfIn PDF document text
    • http://irinabailey.com/upload/files/99480924467.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/juginodagugulanojonowira.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hef9mgdf59shhidih5u1lnci7q/65494756772.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/bawubilewalebupurevaxak.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/72935003454.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/58231996295.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/44781217440.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161470c8fe0815---bezusapinogi.pdfIn PDF document text
    • https://matrixx.lu/images/xadawoxer.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gr9mduvcf03q5p09nevie49g5q/31140634372.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/86952951031.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/527204097.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/83607709935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+download+old+version+app+from+play+storePDF 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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 17560 bytes
SHA-256: d758327409faae6a0cc847af6fd865b909f9aba6f9e497e5e24140db49b3d843
font_02_sfnt_off0001251e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251E 10916 bytes
SHA-256: 5ccb2586cbe2329f0990a650e55bd84676660886887ad6eeb3cc8e5ea98d3f6b