Malicious PDF — malware analysis report

Static analysis result for SHA-256 d496036167e3a3ec…

MALICIOUS

PDF

85.7 KB Created: 2021-07-06 00:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04d2db08af640a9f0c12e0dd77c186c8 SHA-1: 3b52d3fb1f692938dbafb8837fd583641b6ec136 SHA-256: d496036167e3a3ec06fbc19ddc1ba50964cd554c1b177df2f5a19d0d16034b87
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a31c23eb8dd4145c3a5afbb96f43bd6b/35237579233.pdf
    • http://stylowa-pss.pl/userfiles/file/dupopututet.pdf
    • http://asupuro.com/upload/save_image/files/91335786244.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2dbc181b7---bozapigoserokatulol.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf06c53d13---lopamirutevizeloraso.pdf
    • http://studiogiovannone.com/userfiles/files/managutumar.pdf
    • https://readandenjoy.ae/userfiles/files/xikipewema.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1cb535bebacbe414bc40dd44d1ab01b1/82236989671.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b162790431---81497331650.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4899769ed3---gumep.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4060c748---titulevur.pdf
    • http://fine-cottage.ru/userfiles/file/romamabivedowivifekifux.pdf
    • https://digireg.org/upload/beniwe.pdf
    • https://ayurvedaemart.com/uploads/file/95144362884.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33b200589---bebukagitu.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/i207dbbhsui9d13vonrn27hp64/jimobegifupatogefugej.pdf
    • http://www.polni.si/Images/files/nilixizari.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070deda7b1b8---jodedigefabarogenexir.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc8da5acd680a0895338ee7eca2ea1b2/9382743772.pdf
    • http://parkwaywest1974.com/clients/861606/File/81530776990.pdf
    • http://airconbank.com/upload/fckeditor/file/gexarekedafumafoxul.pdf
    • http://otoozevran.com/resimler/files/sunovavigikorilaxavek.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7d4a497d3ad3624f340cd419db1a4ed0/75182951986.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/o81739es7ebqgo2n76uh1bc5pj/bafupekalutiji.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/640a3320b5fa2eafece3a8d97f251659/gufafepafa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=your+love+is+a+firm+foundation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4a9.bin
1e1c63ff6112fa07514adcf0362c7ceac4af8a828aa2f997f4953c891bfe768b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 10664 bytes
font_01_sfnt_off0000ed17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 16792 bytes
font_02_sfnt_off00010528.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x10528 16160 bytes
font_03_sfnt_off00011a9d.bin
2f10dda0111cb70857f8a440695598494cb8e15b5c0c6dd1673b2e116ae5b325
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 17000 bytes