Malicious PDF — malware analysis report

Static analysis result for SHA-256 8594c6db59e7df8a…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 04:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 32460b4f295f24e56479a0e0ebf97fdd SHA-1: c5cd194deac5a89ba5e719a8e15fad5b565349ea SHA-256: 8594c6db59e7df8a8236bf44bbe3683c4cd0fb756a4c8d753ac9a95ce08b4276
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier flagging indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe209c425---40973970114.pdf In PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/20315277896.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6dde4eba---4581772321.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/abd7bc3f6a2d596a5bb221aea0ab709c/tugemox.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jisiw.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kobapasetetogelapus.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dotadezibuzaxezumigimabap.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-3/20210903195804402420.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/93c1162bd3e5edea37d57d2debe2f2fa/50977462200.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/78923138778.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/wapopilugeju.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/87029758623.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/87610588574.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/12859122627.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/39169481447.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/daxajipeteso.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bepezozapiwojixu.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/patosaf.pdfIn PDF document text
    • https://camphacement.vn/upload/files/72876443446.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/gogevamakitudazadubemevuv.pdfIn PDF document text
    • http://www.centralperdana.com/file/81503072870.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lns26ghkorabr1jlqs804dtsh1/73243016847.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/61111550643.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jcaj4pkmuqnspe9ifg0d32ujd5/keginiwiv.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/jovixewiselebomuwedibaxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+fire+diamond+apk+appPDF 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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 10416 bytes
SHA-256: f6682a38e0df34c60adbfbbf6a0e3dff1c72184ba197741002770b375efbfd85
font_01_sfnt_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 15000 bytes
SHA-256: adb1ea5988ff091e91c2fb6d698f81138a79ffe7fcda5bd775b0e6a598f1044f

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