Malicious PDF — malware analysis report

Static analysis result for SHA-256 c926af19abd09263…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea0e77735bafcef08289fe84c689aaaa SHA-1: e5eb87ed498e9afd0279d8645eeb1d0e7a4bfc56 SHA-256: c926af19abd092636d9adc5f6f53e4c5ab1ba06bcb06ba819365925d2b31e2ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are characteristic of a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ih30pc32sit56m4vu9qn6fdpum/xozogemavoda.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a4ece22e8e20bd3400187fde8bba802/18351755090.pdfIn PDF document text
    • http://cmtsport.com/pliki/53758844860.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/27067064911.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/tewasiniteliluzewiropiv.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/duxesilumiv.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/8816103624.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3vfl29015ao234j3maffce7053/bibovamuxarulemuvevitaj.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608a500310d3c---51621294403.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cceadb81d---kuzunalu.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/12463608227.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/10086428568.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/1940117340.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepozipawox.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161256fb33d6fc---3808758634.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/vifibudilimezunizo.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f712b581e7d5289c823bab67b3c95c0c/92916442264.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f9791be91878c9d5e9089b630f393dbb/junaziraxum.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/61021926781.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/27981868860.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zosulepixol.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/lijoxisuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bruker+alpha+ii+user+manualPDF 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_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 19112 bytes
SHA-256: 1634c54f4566172385fa7356d8ccc37b606aa610efea6447c482e495212554ec
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10544 bytes
SHA-256: 5cd4bc3c4f36271f728bcd25e5a67f3e3864c80b29044fef86c6255adb5d3891
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1