Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4b8308e6cf9cd…

MALICIOUS

PDF

134.3 KB Created: 2021-06-25 12:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 389500920024881e2187886a946d0fe6 SHA-1: baa2ad3a3de619badd90996a62f20886e07f668e SHA-256: 5fd4b8308e6cf9cdf4c8b6aa94658034ecfdf4d4eaee6e2a6e5784b860d34ebe
204 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, presenting lures related to lotteries, prizes, or parcel deliveries. It contains numerous links, many pointing to compromised CMS upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=fafi+numbers+chart+pdf+download
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a005a7e2917---78737957333.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3014e4db3---jukuvawox.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2a38cc54f1e94fff94ac8defccc6c6c6/lefopizatakuxufe.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec54c4f18---wiwarogunutogafab.pdf
    • https://imagebeaute.fr/userfiles/file/wusuzimimirud.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ufaorjrrl9hlmuefku1frtlk5/wubibo.pdf
    • http://accronline.com/userfiles/file/kuvobozelumu.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d9e55c8ac---nofepom.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb682d9f5c---vibozuno.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/56cc6f1bb27f98c34c08f5ad68da6044/jerofaferagivezofi.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3cfe4a6ab1bf3d00653824a81d3fb7ba/lilevotebetoputeg.pdf
    • http://industrialdevices.in/uploads/riwifiziketamopebizawu.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e082a9c128575ecaefb076f0b21ba61e/30358889941.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1f977371---panuradisopesapasumenafef.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2232e79ddd---53685911740.pdf
    • http://ambulanceservice.pl/userfiles/file/tizuru.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2fa6c634a34b3ce81bb71b507049f38c/51682903063.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160779d76f1f92---nusozaromi.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001875a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1875A 16792 bytes
font_01_sfnt_off00019f6b.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F6B 16144 bytes
font_02_sfnt_off0001b4e6.bin
10be8ea2493b2ab3b8dc7ff2c3ff37e3cf71533206da2bcfdd9a5ce80d7138da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E6 18604 bytes
font_03_sfnt_off0001e508.bin
687f7d2f375a468a9ab98c0f06cb5868626b958c8c6412b6692c020a97e08b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E508 11188 bytes
font_04_sfnt_off0001feca.bin
e01b4c32c1a7293fec497f66a556736d3a364c0e6c2ec72ef04f267bb8944ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FECA 2448 bytes

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