Malicious PDF — malware analysis report

Static analysis result for SHA-256 12459e225f4a3983…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 04:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 73ce8a0ae639f0e88ae2ec3bbe87d68f SHA-1: 5c4236b88f4aca021a0e8c4afa9f68ac67c32c05 SHA-256: 12459e225f4a39830198a708877f11425f0193d66b775d55a05dec8625f2d003
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and embedded links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://arichaindia.com/userfiles/file/rutupaxilaxokaru.pdf In PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/zizaritejasizi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130289924127---vofarunomulawepukazad.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1d0c3ca2e1ecb0c612852de5f05dc88f/dopanu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e60924485---63270791701.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbee0707c---votemunuwuf.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/74277317847.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasaderew.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/tufavidijito.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/34035027598.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a54dfe9525894a2a7f1670204ba51b28/70064756195.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6e5cd722---90261617051.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/59245625260.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/34161496017.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/66589085208.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/52407861059.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/68351207597.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/20939052159.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/rokosavubabigudafidemu.pdfIn PDF document text
    • https://birotex.rs/images/files/riguratida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+godfather+subtitlesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC398 16856 bytes
SHA-256: 87a9260745cf0512b129579a0f76d98cd2a3c75730ad77d8d37a3d6cf6df04dd
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10732 bytes
SHA-256: e7dbab8ec62d4976efa32494e7063ed479ce77ce2f45167f52863b644aaceed9
font_03_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 17272 bytes
SHA-256: 0b26e2b1dc1e2e63b823e913c9067d7a6e0ee737069fc8e0d1108f24df40a3f8

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