Malicious PDF — malware analysis report

Static analysis result for SHA-256 9565465a923ae3d8…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 12:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a371d1b3c7c576fc9480c4586365b9f4 SHA-1: fc6ec24b6875a56e3ff8b6d76ef989c27aa0d397 SHA-256: 9565465a923ae3d8203f7683bb785fc9cb2c5e40597f1162742e60da528aed5b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to external sites. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://21cedu.com/pds/userfiles/files/xibakoxulutukemod.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06a892627---22147908197.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081740ab64fa---10072648564.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9590589342---84664603379.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/864e61fb4451f504b74cb3bc79346b18/dodaleg.pdf
    • http://connect-senior.ch/uploades/userfiles/file/83423011352.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/21foei15mgvq280aqu59auk502/12410719760.pdf
    • http://nissanotogovap.com/uploads/images/files/3065622491.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/erk0mn4pdvh6conapi8tafn0db/64600948866.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/bexujiputewo.pdf
    • http://iziusb.com/userfiles//file/tepugare.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/a1snq8k0h2clpptc0qjg6aom8k/sarozoveli.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/okkvf52r2k8imkggrg3ibprend/12549824626.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e9e3bf2cf---megaliweta.pdf
    • http://sungsam.net/userData/board/file/begori.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b6e768d646cd742577247c929c8f59af/gekivepeko.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786097ef4---58897113558.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bqrhg0kk3h29rjsb2c8bhcsru1/58341633824.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/96583395414.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099c83c9dd72---47494561907.pdf
    • https://giasusinhvien.net/upload/files/17754750419.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914db6912a51432c7fa0bf24b329e54d/jakadewipepepuzewaretewo.pdf
    • http://fly.no1-yes.com/userfiles/file/jalutetuxemasol.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3c12e571---60185610354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ios+emulator+for+android+apk
    • 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_off0000edc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
font_01_sfnt_off000105d4.bin
b4fbeefa1894cbff693fa3c1871f7db3bb3e7bd449363d563c1a6d15435d9b71
pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16992 bytes
font_02_sfnt_off00013240.bin
397fa6b07e029ccb9d64cc37b43c3bb4e4e13e83b006ac6425bdcc5cd6c3a4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13240 10804 bytes