Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a3c30207484510…

MALICIOUS

PDF

86.8 KB Created: 2021-06-27 08:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 054d296f310123e1d371ea8d262d175e SHA-1: 957c2fe9910ae503464840ddcf08dc9f183f309c SHA-256: 35a3c302074845105392ec605ee884f697bf1ec367f2383386f609296599e52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content under the guise of study materials. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ftu6lhskkrghppifvg3tgdnt85/57217201162.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c53b07810---mitopoku.pdf
    • https://menuiserie-sainte-anne.fr/userfiles/file/dogoluzafurumilemufeg.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/24447193774.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609fd119ae---5052774609.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/segureb.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089c4d35b856---55254830780.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6e3b92603147f63e5abd58e81a55d810/32903442676.pdf
    • https://alteanetworks.fr/img/file/3488556637.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92df2699---37230556269.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6n3e6f4j8c2qdrk8497pehq1ot/3763580942.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b78f8bc21a9---84138010732.pdf
    • https://fisheaglesafaris.net/pics/user/file/27624671232.pdf
    • http://www.pranabkumar.com/fckimages/file/bexevuxe.pdf
    • http://bomtvplus.com/data/board/file/20210606195505.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b8dd4a3a33364ef16d7b99a97c9a03bc/34327637954.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aac05370086---18381749334.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/judadasulapatusesugetukes.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/c8d2dc66648d9005fd5d40cea1385a4b/vobig.pdf
    • http://www.annaleehuber.com/content_files/file/45040880835.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf44703b19---88052374667.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f48bf005b---63710638292.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f7ohejfjnm5uft1g8mgin056l2/zeluneleres.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=frm+study+material+free+download+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 16792 bytes
font_01_sfnt_off0001062b.bin
ab9426f40f6ce166be7f7c9525a3c089962313594fd1e1afbe73e059c6cf7e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 10936 bytes
font_02_sfnt_off00011f92.bin
2eb3cae4bd50dae8ac86dee7ba7d421e135faf048140d7ae51053595dcd80b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 17604 bytes