Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e89d0d73112d61…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 08:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 884acb4128fd76c77b191214d110ff92 SHA-1: 311d4d52c12bc02369d2b0637511911def8a3e87 SHA-256: b3e89d0d73112d61a20c01e5367f1337c56d115bdd2c6e83f82658a6d5038cbe
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, with several hosted on compromised WordPress sites. The primary attack pattern involves luring users to click these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://study4student.com/cache/fck_files/file/1561420267.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfdb1fb8a---lovazonigizuvukemese.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3700009aa7---wuzaj.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m8f2n497pm9ce49qrp8o8bfgu1/majawesafut.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f233e55b---denodelumunidasexolevofa.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e389f40d1---defaxibikabuxofak.pdf
    • https://ipic.vn/userfiles/file/94897338906.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7842445c8---benelu.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/nvmq02afsmjj1no3pgmgv68880/rajegip.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fee49db208d7bb7f18ef814a49b719cb/mulepuzi.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f48d9281---83553416804.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jkgn6uh9hui100vbg2tt379pk2/13202299029.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25f675011dd7c660ec6cc0da77a4801b/42075443882.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088e20f03317---dojiw.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/39c2c877dd669d49268ff4a6e47eeaf9/79556340963.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/503b2cfacd12cc7dc2c2c8f6006eb943/fovadonor.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e2c6e251e6c567a18d281755252d74d7/xuvumagaredevo.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd2fa7801---fulekomiwalirolopodanabag.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m7vk2f77fn38rfuoqir10880g9/taxadov.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ecc43a92b---paxubesubokapa.pdf
    • https://jobtiara.com/files/files/43231764649.pdf
    • http://www.tokyomagic.jp/images/library/File/femilujeji.pdf
    • http://scandirent-new.ru/uploads/assets/file/17747144388.pdf
    • http://constantcontinuity.com/membership/data//files/poguta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=all+your+perfects+by+colleen+hoover
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/19fa66f76509ca2bcc7ee3eb61b50ef0/31731393252.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b71.bin
07e8763d7fcc5aa2d612a79917451ef64e1dc22d2ae922bbb5d257b6d6b2008d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10724 bytes
font_01_sfnt_off000133eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 16792 bytes
font_02_sfnt_off00014bfc.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFC 16164 bytes
font_03_sfnt_off0001616e.bin
ce991a5d82ea55e770cc34a275fda84bb976d522738ab92f15bc4cdaf62fcbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1616E 16696 bytes

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