Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf96c274e049eb90…

MALICIOUS

PDF

87.1 KB Created: 2021-08-08 03:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19f90324379bacbf23e2ce0b631e3cee SHA-1: a248fe218423e6ed319a509e8c386e5d6e881c63 SHA-256: cf96c274e049eb902e5e47dab717bc256d4778a1af8c4af7510225a52abb495c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of a link farm on compromised CMS uploads suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://phrabat.net/UserFiles/File/81093129016.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f7cf529f97c7f0e8cf9747b61cc44e42/3299073143.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/3027056104.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/72623624508.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/monizupi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b363740ee03---78548088792.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/93956432873.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/memonakofura.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/de2fae35677f6f597f71a9332f0df280/98235874217.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757e4f6aa7f---ruzusotagovig.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b203a163a4c0439a2332dafb38c9bf21/pakepile.pdfIn PDF document text
    • http://jsdarvin.com/files/3294214804.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/merigagezul.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/87131991652.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/palotenosisi.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210526194910.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/50230388345.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cc2ccec99---42256498426.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/lugulix.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/84816627963.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/50bb211c0cd9bb1340976d15b7e0d91c/77628264929.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6411cb71---rofiwepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shams+tabrizi+40+rules+of+love+pdf+in+urduPDF 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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16896 bytes
SHA-256: 708edaadc65d05ec28fa60d76d05337b37df1bf89953a31e59132970688c7026
font_01_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 11404 bytes
SHA-256: 847f7a0a12d1799a7a6cc26298ed96258302e4a26cc3f51630f9ba1001c45c85

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