Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81edb2c731c8ee0…

MALICIOUS

PDF

246.3 KB Created: 2021-06-29 13:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9157809f022be7709d75331c25fcd1a0 SHA-1: f48dd2c7b2acdce9c2d907ec4fb06a3c2aea00dc SHA-256: c81edb2c731c8ee078824ef2b30dcc2ea7926657b5c164b3d5fbe86cb792fba9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, several of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://teplospectr.ru/images/files/mujilaxikexux.pdf In PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac79ee85f2f---74937902444.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/dafakukideluwu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/96920632551.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/796403159.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/130da55bbe31460dffdce16227e89508/xitoxepomu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb4a1f2eeb---pubaje.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cb581eecb858a71c9bed15c22318a0a6/17985050015.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/7756844896097a8fb8ef77.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d24343567---50020115602.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/nebeki.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/76407102895.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/95793744414.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2247b23bbbfd124d32755f29e86d434/fodisusibimunokilabevilu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7c5c0b2b25f08a95971354707470b732/duvufexeteguwumatanube.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2fa00924373804fa1ca4b0e65368f3e3/juganikufasidiniwaj.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854aa378703---viwefunitokonizosowi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/24421f03a43e8492fa559387ab5e9585/marazisozopevafapuxapam.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aab17a093---4204555829.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607024ec9a099---64745054662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=framing+of+indian+constitution+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36BBA 17140 bytes
SHA-256: 7f46d77e5df516341181ff65d812e403194e183282628953b08ddcc969e16af0
font_01_sfnt_off0003984a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3984A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B061 10860 bytes
SHA-256: 3e878a69836078ddce20590de8a8c717afcd06851c9c004641840cdcb9fc5a7d