Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba3e7dec273445c…

MALICIOUS

PDF

84.3 KB Created: 2021-08-14 11:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1a25f9573c2f6a27ac74755b33662454 SHA-1: 139036ac0ea8bc58cadf4f169295323796f934bd SHA-256: 8ba3e7dec273445c1eee791f70dc45f3ae94a165d5d44343d6e72e332fc06bc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the heuristic firings suggest the document is designed to redirect users to download further malicious content.

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 http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48f9c18fe---22815901869.pdf In PDF document text
    • https://wineart.online/userfiles/file/dabugifomaro.pdfIn PDF document text
    • http://come2menorca.com/images/file/silekedoxexodu.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/74547467633.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbd2626f4b---tabavofoxiralumeru.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/dopalajevobovijimofupo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160831c51f2c15---67110700116.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/eprouc8gmgb98jbkuj7fqtvn3s/6360305902.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/niligakazivawojukudujuz.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/11448363443.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/serenufitarenotowel.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/tigopakiburejef.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610303d04e083---lupugulonobulad.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e7433a52a2c5af38be40861ea5977ef9/muvavimawupe.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/3cc492c913f71a0ee42a8528e92655f1/63289698496.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nifoxidunak.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/98216821975.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/dikazusura.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/miredavojevadoki.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/77479287972.pdfIn PDF document text
    • http://terminsk.by/pics/files/xezevuwu.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210618_084811.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1dcjkv747kucenfql6phj8m9he/xebeti.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/47979355007.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/dalipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+the+boss+baby+2+sub+indoPDF 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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10808 bytes
SHA-256: 5d5e675e6da288f1ce27a987e4192cb5048445c7fde42fcb38e41e814d03b496
font_02_sfnt_off0001160b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160B 16936 bytes
SHA-256: d34c83873d07c470ba31c3d9975a96dc52d1325dd6b2e1e835c86c4e014bedbc