Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead7a71648db3f5…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 20:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 754834c34efe0bc93247ffda0eb0973f SHA-1: 63e60bfbeefd091090d67678ff3b5677ec1b56ef SHA-256: 7ead7a71648db3f53ae1f86c88c33ee521738a6debe5ac3342f723635b878abd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3e12c855---bafirolefagigubobebute.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/16180960583.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/rqddcdb5j6edovfthf23p3on65/lagovebeko.pdf
    • http://turar-mussin.com/userfiles/File/24525139641.pdf
    • https://aawyx.com/sites/default/imageuser/file/pomanubufadowupesowak.pdf
    • https://udruga-invalida.hr/files/safabamagaregi.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/bikigelotenededodepa.pdf
    • http://fine-cottage.ru/userfiles/files/92073023932.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070461a11926---vavefo.pdf
    • http://zhengfutz.com/v15/Upload/file/20216272258206123.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e443fca2---11276450136.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b755df27---55820378419.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8dd56b875c7efc17a60f5dbd4c32ac8c/fipune.pdf
    • http://pamat.ro/UserFiles/file/44825049927.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd0e3f1379---vokomeli.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/36a07448fdb3715800d5b89f5130ef72/38474417427.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472ff275e7---rijufajogidaxivenadixu.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4f05de60---majawuvozotudajidelesalal.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/bapapukezele.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609619cd13b66---petavenopezo.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8a61dda9---77569990049.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1a1e7b194fba6b76b89f3b2d29580b06/6575756842.pdf
    • http://nuraski.pl/wsg/userfiles/fimagexebofipurirewuduvuk.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f0313496c---87041894179.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/778976e98d16ea7810fb7b747816dbe7/22166337775.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=about+the+situation
    • 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_off0000ee7a.bin
bccef3433d4ce93731873122a205133ed082d922b70f8c0ad207277ca0e4cbed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10280 bytes
font_01_sfnt_off000105a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16792 bytes
font_02_sfnt_off00011db7.bin
974a370f3fe45a65098d8f4636c6a9bd93f6e910d96cdcd0c21c2d69b7b5dd36
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 16936 bytes