Malicious PDF — malware analysis report

Static analysis result for SHA-256 4857ab40bf2b9922…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a658c65210e14cd067892459e41d042 SHA-1: f4392657c6b701a9ba1cf565f0bb046372e76fd1 SHA-256: 4857ab40bf2b9922127fa0224e3cb82e50b8b69ec040c3f2b72f412f422deecd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of link farm heuristics and external URI firings confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d53b86b11b1---17810042191.pdf In PDF document text
    • http://korean-school.hu/hangul/userfiles/file/94021144438.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/2632792890.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sbc5hobr7mqhl1oi14lvrss6qj/65539136817.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56e0d16f5---78193758794.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/japutusibiwunazeb.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/40108051498.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/43762727262.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/337663481531a5a8568f6097bd4ab018/60188596760.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/49339288a737005ffc00353032ba924f/44440453197.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/10624307584.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1d48fb3210dd173c8b051c792a96a435/3676586857.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608510bd44c1e---41885347871.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/tfgnm2c7covl43sgq2kh52d27r/21048610574.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/90856484310.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/69414370306.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/32e1c6fbbc10f9ffc2e65c1ff015d0c8/73895173254.pdfIn PDF document text
    • https://invest.pl/userfiles/file/23121252417.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/94084946807.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/b24ik8a90pigmro3n8pu92diub/99232758181.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/56146020183.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2d67c1edff9cafd6d30e1a0ff3e08fc3/loxazofepumuzakatadositof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bollywood+download+sitePDF 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_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 17136 bytes
SHA-256: 12cd71704944d17db2c7b4b422c17c047640b071cda9a34fbe933718bb8d31a8
font_02_sfnt_off00014f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F45 10396 bytes
SHA-256: c186bbf4412ad5e3c5b698ff9e25c489dd5fa0b3504c89594f4ae31f08ef1573

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