Malicious PDF — malware analysis report

Static analysis result for SHA-256 440f6cc7d891e802…

MALICIOUS

PDF

83.8 KB Created: 2021-07-09 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76e67e3bb36bb5346e784a939a85cf22 SHA-1: b309e9993b2c44d3aeab64f930f53360048264f1 SHA-256: 440f6cc7d891e8021116658486ff237dd5070c167bd3bfec64d755fcf9cc7e8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the primary attack pattern being the exploitation of user trust through a deceptive document to redirect them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://arredamentoambienti.it/img/file/poronazimuvaraziloxodux.pdf
    • https://laser123.com/geektic/files/refepozalowegamuvafe.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ab0853b8---gegatibolufizil.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/72c2933d86bb3d4ca3d7cebc09eac399/pizoras.pdf
    • http://asesorgubernamental.com/images/file/91257207843.pdf
    • http://1utilaje.ro/mm/file/6005371477.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3691158be350fff497ca3c586354906d/87856057413.pdf
    • http://yilip.net/userData/board/file/92548008959.pdf
    • http://humanitool.ru/userfiles/file/pilidipujamifal.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a0e13af4---26779247243.pdf
    • http://www.cenlafilm.com/siteuploads/editorimg/file/napexorojup.pdf
    • http://www.jindatunnel.com/up_files/file/1754663770.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/71tf3r363mo1711sdd2ig7b31g/kifarebidusagaribum.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/76886594620.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/kezaxozobupelepuzitogew.pdf
    • http://lasfyy.com/uploadfile/file/20210705065016088.pdf
    • https://tungqibiotech.com/upfiles/editor/files/36682260988.pdf
    • http://cokhibaosang.com/media/ftp/file/zumiwi.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/toghbekijfv6420r0mp4l8bone/46888366289.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/822d4ef0d5d9ed267c439767b32054cf/perulizotunisimesezukik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=liquidated+ascertained+damages
    • 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_off0000e343.bin
b925f3a3fa66927239b92bbb61bb61d3b2984aa411d82941b4fad8382dd6a2f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 10752 bytes
font_01_sfnt_off0000fb74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
font_02_sfnt_off00011386.bin
c2623ea4b40cdef7a0a3abcc59234855e8df852536b43baef61d2a6500c44404
pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 17812 bytes