Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d31a6bc3f3ebc8…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 00:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5e5eb00ec15ca5b5a19598d0429b3b0 SHA-1: 95fa55be496ac50daa001fe2df7501d6c1bb067e SHA-256: 02d31a6bc3f3ebc82b9b77492b4ca60315ba2e1fb8327af98ee98481cdac4688
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded URLs are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://queure.ru/uplcv?utm_term=battlefront+rogue+one+vr
    • http://fedime.org/imagenes/13016934723.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/36367ef0cd3bc414e3279e86589b6949/fotisavofu.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/e04061k16grf4imqr41cths1e1/82488680647.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/75615daa2695ae0cf43c570b17c98254/59715937313.pdf
    • https://prestinireedcorp.com/userfiles/files/95817916532.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2aac5393112e5e72d56c1717e68b6529/49926693754.pdf
    • http://oreade-breche.fr/userfiles/file/dimijonasabasedodadukuk.pdf
    • http://www.yoko-ono.be/images/userfiles/file/zegewirawa.pdf
    • https://inncredel.com/uploads/duzowab.pdf
    • http://ascensionchina.com/userfiles/file/mazozomawuxufefogexuxe.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef00c04b67---nuwifovizeveg.pdf
    • https://apskarota.org/userfiles/file/pudemavenovirikatodomot.pdf
    • http://billsky.ee/files/file/29296792579.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/16dc052ca0f6ec9f9675b2f82d281436/4610788790.pdf
    • http://alliance-ltd.com/userfiles/libedijaxilepuguxi.pdf
    • http://doktor-okonski.pl/uploadimg/file/nupop.pdf
    • https://themis-lex.com/userfiles/files/runafifan.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/vagogukoxemutofoka.pdf
    • http://alkanboya.com/files/file///73212191695.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eb1382e2d---vuwenajudabakunaw.pdf
    • https://hoangnhataudio.vn/media/files/54263743065.pdf
    • http://www.77ice.com/upload/files/77474311307.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef3c8664c---7376317764.pdf
    • http://learnersdigest.org/userfiles/file/nojopugosixiwefobep.pdf
    • http://aep-tc.com/cache/fck_files/file/bowozemiwegarab.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/glv0skgvevip4folnpiea7gjjl/nudewazolekug.pdf
    • https://penzionradvanice.cz/res/file/82586057355.pdf
    • 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_off0000ec21.bin
7accc985775b83428ce3ba06bc35e64ccb9d93520c80821cbf6908b68ca8179f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 19184 bytes
font_01_sfnt_off00011b96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B96 16792 bytes
font_02_sfnt_off000133ad.bin
2ce0b5554bc07e83cc25593546cd4faf056343b3e47cf833ff150334d1234a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 10348 bytes