Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e63538e40bfff5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 15:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 428f2e6a125ddee50bbbb2e033554045 SHA-1: f6601495dd61c7e3a9f9e2e51cbfe9ee3d4f4c93 SHA-256: 86e63538e40bfff5012c62c565a90040dc91baee12a37d3e48a13fb7707e0052
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f083e311b6---jefososuzex.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e2fc490a3---vupimoguxuzodugudowato.pdf
    • http://uptindia.com/newsimages/file///lupimipijojujilatesuz.pdf
    • http://woodlander.sk/grafika/file/27777948585.pdf
    • http://rujiahk.com/uploadfiles/file/39411895991.pdf
    • https://pianotuningdarwin.com/userfiles/files/zejerubenokutabefoxoze.pdf
    • https://careersourcechipola.com/files/public/38367599798.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c87110203---lijipizokofedefisikusi.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b138d91e2---22404962868.pdf
    • http://ecoaga.com/documentos/file/jigitixebokelonamakimoxol.pdf
    • https://simon-daulte.com/ckfinder/userfiles/files/66424066239.pdf
    • http://dichvumucin.com/upload/ckupload/files/76310854553.pdf
    • https://udruga-invalida.hr/files/nonavigonovalusugipava.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b341692a4e---85700980084.pdf
    • http://www.polni.si/Images/files/27216653562.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf731c480c---10841685088.pdf
    • http://csp.hu/editor_up/88351178770.pdf
    • http://kryotherapie.net/neu/userfiles/file/84375022141.pdf
    • http://gdlejia.com/uploadfile/files/20210904_082333.pdf
    • http://fujiya-la.com/uploads/files/lasuxisonezunevipixutapu.pdf
    • https://projektovanje.info/userfiles/file/penuzig.pdf
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/43050229675.pdf
    • http://lideparts.com/userfiles/file/1631362210.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tekken+free+download+for+android
    • 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_off0000db6d.bin
f74b7b508838f49104464df9062373b0e620e9cb6ee0594b8d1e9b04b0a522fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 10224 bytes
font_01_sfnt_off0000f285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 16792 bytes
font_02_sfnt_off00010a97.bin
e0a5ce8dc91068cc88b046c913498f39b75d90366e72fb867fab3b05b1d798f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 18024 bytes