Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffc735cc243ae29…

MALICIOUS

PDF

78.5 KB Created: 2021-08-27 00:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a48e8873d8295217a1f3b067b4b2dcc4 SHA-1: 601110a8831fba0ec6fe26643c13708028013343 SHA-256: 5ffc735cc243ae2931f536a8ef0a835ac4472f7a34d19c8f486540d84fb4f2b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b977beb226b---73911808918.pdf
    • https://sasalidayanisma.org/uploads/file/9024655603.pdf
    • http://carrasvilla.es/uploads/files/65283977847.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zimeta.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c319d427220---juwuteju.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f8e84c883---toworesugogotegu.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4a469144aec55336cae88655e6d48105/48488061142.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da238559a---20611431179.pdf
    • http://campbellelectronics.com/uploads/38295560585.pdf
    • https://imagebeaute.fr/userfiles/file/63585470127.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2155c58f2842c7d79d55cb05c762d337/20743276869.pdf
    • http://jrmhandling.nl/upload/file/livovus.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/22672271392.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065c2db3b5---safokalaxirabibodovogen.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1lbri1atk80qpb7ofujlibc1ik/rudiverowifeduzat.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9d6478f7---89267853496.pdf
    • http://vinmexindia.com/uploads/3250139005.pdf
    • https://euroroma-bg.org/files/file/81073809347.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800245d1621---99758392562.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v6it9e9tc77ad59k1rnq3c5psf/92557399423.pdf
    • https://aslimitada.com/userfiles/file/80271290513.pdf
    • http://fedoro.ru/upload/file/79374705602.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mlk+darkness+cannot
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/a7ee8105537a27916327bbd2379eb7db/95895821067.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17e.bin
d56e8982d879fafdb5986c25954d314413c14bda922217612a5e50c0f1bb47c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10356 bytes
font_01_sfnt_off0000e90a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16792 bytes
font_02_sfnt_off0001011c.bin
644833be3382c12a0ed9b32ffd9fee819809af09b763ac57eb4802bb4b481ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011C 16852 bytes