Malicious PDF — malware analysis report

Static analysis result for SHA-256 753fef0d4650d924…

MALICIOUS

PDF

95.1 KB Created: 2021-07-19 19:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 807cf987e2ede3d9c2e616b16a99903d SHA-1: 50edac854d1bb2b24e5a536132137a54837d6f28 SHA-256: 753fef0d4650d924c85e06f726c1c1d03b06d0ecb06fe98ecd1f0395ff2f2310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous links pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://yaqeen-eg.com/userfiles/file/29335557069.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01fae89cd4---wusawisabupemuwavixud.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s62g1jeshpolk646j8ts9gl0i3/85051626469.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ceace67b931---lututoridikasugeva.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4bc18cfe---gewelunexikewep.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080007f63935---xiwabowir.pdf
    • http://mp-journal.com/media/file/puxogopam.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf8a48386---67833965490.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m11ka0uvofaqlb8dddcckvegmp/85759854551.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/gebevorewakosotaguxubub.pdf
    • http://magogaralbamoble.com/galeria/files/82256313420.pdf
    • http://hublihorse.com/uploads/userfiles/files/watifuxejid.pdf
    • http://snap-drone.com/userfiles/file/golow.pdf
    • https://thietbivesinhanhhuy.com/asset/files/74824151705.pdf
    • https://widepolymers.com/userfiles/file/99203996281.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/99942799834.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f9fai6imb1qcqno1damn363cgc/zobenajozaxudivekimemo.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160830b74670a1---87951224515.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e77ab09763d---32240871458.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3c3ae13f2831fc69971a3855f9a88026/5781618666.pdf
    • http://leguido.net/files/74484588814.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72f634fb83---95764913451.pdf
    • http://ginzaoakland.com/uploads/files/27969784107.pdf
    • http://provia-events.de/pics/fotos/1/file/37885109252.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=accounting+basic+interview+question+and+answers
    • 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_off00010ecd.bin
45e09d30980e0d488cfc66ef0a4f7a8af2b2a5ba3de9e5694564029861e9b81c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 11016 bytes
font_01_sfnt_off0001282c.bin
9f3b97d57ec8021b17b6e0ebf46f4e55a005e8e04573a056774093e2f371ce0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1282C 17636 bytes
font_02_sfnt_off0001569b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1569B 16792 bytes