Malicious PDF — malware analysis report

Static analysis result for SHA-256 3424fc820ca6daf4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 22:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebe1598a1b995d9ed585901b75729f56 SHA-1: c822c6c4d8c68f1f61d950fc857aeb9fa6c8c7ea SHA-256: 3424fc820ca6daf44f5905a1174c7c22c0ca496b361e003cf3de430969a9c4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards the use of embedded JavaScript to facilitate redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hu041clj3da198306s173qu83m/72488465935.pdf In PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/95182439463.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0f160be77061d7ada452df3eb2d9a9e/80463129277.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/94571880292.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/fubunufuvovarogupigas.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/jitozen.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202108150128283994.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wimuxozolemeso.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/94026020263.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vv0ce4ejds946ib6qq77gpge10/vizepovajed.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210621_142422.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/83a77dbd42b334cd8a8eb4d66d8ef78e/lifuk.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/mubexovud.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/af0ee5865eb7a875c0069153d5d1768e/zetiridibifusotu.pdfIn PDF document text
    • https://stopserv.ru/files/file/79688057970.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4a4342392e213eb3162319bfa8eb1b9a/rakowisidebiri.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/115e33fd294f2191138ff3abdd1c1754/mererulifuzobe.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210901140459.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3cc42bd6c---poraxageto.pdfIn PDF document text
    • http://elskenecologie.nl/files/86704329751.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/zurewusa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ccbb0b46e930f774380a901b5d2ee670/lenawexijuvidikabilotu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aad6af082---zakuvesodufimis.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xevove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=merge+pdf+pages+in+one+filePDF 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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 16820 bytes
SHA-256: e2da7fbd1599dd4c4d08dd18fe823a79a725369529318bd69ff267d776a56e00
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 10568 bytes
SHA-256: 1c3373cec0174b28f543e434b9f94aa358edae57edc3f3bc7fa5c4083d0ea313