Malicious PDF — malware analysis report

Static analysis result for SHA-256 53133f9c37ae501e…

MALICIOUS

PDF

93.3 KB Created: 2021-06-27 06:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c76377a89014b066f9a0d7ccd9daf27 SHA-1: 258d74bd953aee42a5001800da9f54dc093a484a SHA-256: 53133f9c37ae501ec7c4115fd7015fef9b2fa4bf33c6b32d31aa97944f6f2d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/6agg855vlskh0493d8peu6bo34/vuvijabojebuwevezur.pdf
    • http://twfbs.com/ckfinder/userfiles/files/86679479982.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67d2b09fd---jamoduzudotip.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d71faa66a---57944748556.pdf
    • https://moscowfashion.net/content/xuploadimages/file/57502720604.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609130a240f4a---papetagax.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d4f20e9aecbe26180a8b599c8c5fedde/73437324203.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cgmf40jkq12t9r1bf5pj0o9f12/bopemafozivelojewexe.pdf
    • http://promador.pl/userfiles/file/gupowaroferexekuwe.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/litasowagakuzatoka.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f557ca1615---94011687216.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac724a93c31---75350208503.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e13305eb---fusodirobiruzorogigubok.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e3e2e81ca9ca2fb850c9b50846acd2bd/luputozuxasajakogozu.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/sg5no5s3evir64m0i8su3qj8u3/48624769939.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//89882958780.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ktcr3lh6fvomquh7hoq7hgk957/74098719844.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d35a5ac30---73268305940.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d4bf710b9df31fc3ad69937a6914da8e/mazewevidipalawez.pdf
    • http://vimbark.sk/editor_uploads/files/81675653178.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1f0ad75104003eb0d0714a10f2258269/zekobafazaxabonenejiravu.pdf
    • http://studio-castiglioni.com/userfiles/files/lavuzepoworan.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c511619a064---vepugizasutunux.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/jozenotifibituxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=1+tb+disk+storage+in+a+computer+is+equivalent+to+kb
    • 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_off00010515.bin
1274e7e0d5a8f0c06c3c2e47b2e05ae7e1655e779c84a51bb5d9fc14ee54d438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 11356 bytes
font_01_sfnt_off00011f14.bin
806cdddb37b2062c1f4f2f6689d1c127c9824cb5042ca7cf6e7fcd6f8dfb7265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 18640 bytes
font_02_sfnt_off00014f87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F87 16792 bytes

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