Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19094d3d5f29cd4…

MALICIOUS

PDF

98.7 KB Created: 2021-06-25 12:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5493078469d56ae4f524284228c3d239 SHA-1: 90956cc81551562b244e2a32356af88e61f6951a SHA-256: f19094d3d5f29cd4deb1fb1ca4798d210ff2ce8a64350e7e6a67dc71ca514abd
156 Risk Score

Malware Insights

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

The 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 WordPress upload storage and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://oticonshop.net/ckfinder/userfiles/files/21697036853.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f704ac8d9f1d5be8c5f80a00dcfbc836/71447975216.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/5988111941.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/r6ori3t76pp9nlhjgh49rhq1q9/97114117384.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/56317002261.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f1274d84---niwajirupomuw.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/46a26cb19c9946cac26a20521193c632/sumolezofokaz.pdf
    • https://waroproject.com/file/tuditil.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a385bb29acff617fb3f0a940fbcbc5a3/99830885146.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3369025bec---9006687626.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/cob098ci18vvsaqrq1373l28fr/lobugawefogewekexew.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/no1sjatq6lk4v37gkegp7ihk7t/39717173762.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/4qh2b7qiumutmrsplcomenp5qb/12208191943.pdf
    • http://penzionklara.cz/userfiles/file/nagikovura.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7h9e8i35hj373mbaueokfh74dv/71224529570.pdf
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/garireb.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65105187c7---35663385966.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d22b2ae4618---tovigapipidulijovejifu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=passive+verb+tense
    • 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_off00012053.bin
2231fd5ac7416f767c60b273467bfc586699ca84e1fdd5d032177fbdeea1caac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 17820 bytes
font_01_sfnt_off00014f30.bin
773b5db835f94f2fdc96f42a911248d0e3517adb39fcdc5aa51d8e208e441b27
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F30 10144 bytes
font_02_sfnt_off0001660e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1660E 16792 bytes