Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6e4aaa948fe733…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 03:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6293ffdf73bcd0ce59f3545503d667fb SHA-1: f572d16af4cb666dd358369230e801ac18527cef SHA-256: dd6e4aaa948fe733f8629202367ab2a6348ecebd3150112ab07f2ffc3ae06a13
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://reopen911.info/media/file/15093727862.pdf
    • http://marymo.ru/uploads/files/28446366872.pdf
    • http://makassitools.com/userfiles/file///pilewudaxogabe.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/wiwubekedobatoladusum.pdf
    • https://mattress-leader.com/media/33942207001.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427f936242b---19957723703.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b77f9de8f---fajetajewaweku.pdf
    • http://studionegrelli.it/userfiles/files/zujun.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/vupujukovodu.pdf
    • http://vlajkylevne.cz/UserFiles/File/veximo.pdf
    • http://zezoalza.com/ckupload/files/febasixapejenumunamutujav.pdf
    • https://cian.hr/userfiles/file/puruxurusodojukoloju.pdf
    • http://dinobajka.pl/Upload/file/pixuvukepokarugaduzu.pdf
    • https://seeandhearbetter.ie/img/shop/contents/mobipapuzasape.pdf
    • http://confidenzacsapagy.hu/upload/69108763556.pdf
    • http://agilesolutions.in/uploads/55196057369.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/fozupewezeviwodur.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/xofetazukosaj.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/veridepeviv.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405dd4e9664---fekumidaloxexovu.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/zulawesujetajekurakav.pdf
    • http://epoptavky.com/is/images/FCKeditor/File/60627839445.pdf
    • https://reitinguok.lt/userfiles/file/67891034912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=new+tamil+movie+online+tamilyogi
    • 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_off0000d51f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 16792 bytes
font_01_sfnt_off0000ed31.bin
28ecbe7d652f092380805ab18be01fef99a1a5c8fee6fe50f07ab405861136e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED31 17188 bytes
font_02_sfnt_off00011924.bin
d8267d2636941985e14e513d80b823402d032f5ee8b7d3389a5041d8debfcb3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 10424 bytes