Malicious PDF — malware analysis report

Static analysis result for SHA-256 85225fdffb957a7c…

MALICIOUS

PDF

87.0 KB Created: 2021-06-30 22:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7dc89e8b5b24c844ab395c3c4629f57 SHA-1: 8cda740568b7b216614f944503a45d406175c4d8 SHA-256: 85225fdffb957a7c46dc944dcd05c099717b7f2bfb11f325bc9bfc7644302c4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carszana.com/image/upload/File/95015785028.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072409892dac---tetikizuzexerisedisetase.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893372d957b---wamifosejol.pdf
    • http://washchienluoc.com/upload/file/52504480573.pdf
    • http://contextuae.com/resimler/files/vekukixox.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7a593bd9---retekujevutok.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/to1q43d7im7dk4te64gr4inksn/kopazuruvowa.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2640256aacd402a3c6fd409a27c1c9c2/89762115500.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507130741.pdf
    • https://zlato-eu.cz/upload/files/mogunalipilusomo.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/74601992757.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cca2647a0---bipemiperawa.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f02ed6978b90c2852e1ad8e62973100c/46484894209.pdf
    • http://attlas.center/userfiles/file/tutusisupavidixuneguku.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075375484bf3---jibodemazumopawijaso.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160869dd4ebad2---terijedejozozodafopolelu.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad3fd72238cd373f48ac254c8d749d95/30389942959.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ceccf264083---botamivasozexazokotik.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/00e1c6329964bb9a954516b5fe528a9d/61385945088.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/69758762196.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a1e15789d13ba60dfdd823dac45364c/sidovoxezoje.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607840a17f136---56966710115.pdf
    • http://se-ty.ru/uploads/userfiles/file/30280037791.pdf
    • https://activepymes.com/pub/file/leluvor.pdf
    • http://atut-biuro.com/uploaded/file/bejoninogilav.pdf
    • https://mmagame.com/userfiles/file/14046717490.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=another+word+for+demoralising
    • 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_off0000ebf9.bin
4ceed125eca6b629f54893f5184d586562bcda11c68aa8cd828e615c66527fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 18296 bytes
font_01_sfnt_off00011c30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 16792 bytes
font_02_sfnt_off00013447.bin
076461e0302d555637e96f547a60abc5df88db41e029e169a9d657626c44fc51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13447 10868 bytes

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