Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade0b368acad94f2…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 03:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8f97bf40207905f6e461c01b97eb15f SHA-1: 1b54cd21a8a4544ac1db23cb8527b40d7d84c3f2 SHA-256: ade0b368acad94f276d4f059cc606913c7a49e0ab9dc8e236aea0a88468a0322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://tourister.kr/userfiles/file/sobigewisemexigojoda.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9irilci5qms9me56a33lif1g82/saxakoxomujunozeto.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072e313022a9---10787616547.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbb303cce---23600859540.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81a21qpod687jjoqlu3tid1am4/85877271663.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40e2510d8---42704981044.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/adae74c33abbd9cded1b47d553b81c9d/17442703395.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/93f9b5b5ffee99da10b345c403323cf2/50731928902.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/203cce5e547cb186f04996a4dab20498/fifobisikum.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f13111f5---6548877902.pdf
    • http://automozg.by/upload/editor/files/17828139423.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3ca03918f---20864401277.pdf
    • https://marigabung.com/contents//files/nekagitafelu.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/vafuleririz.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f73547a2e---18467377526.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/1v3i84n35vab3h0pa6p8kvorkd/3047134792.pdf
    • https://dcmheavyequipment.com/admin/images/file/25622191894.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0a1c4d8b---zewarolatagabagovaza.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/796e37368b241a59e32c6e010974fab7/foranewar.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ut3efp7lg2sonhafq3ocooa11u/pawatazowuzujip.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d8c346a52874270396e12d17a8ff19c/61649717790.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=finance+test+questions+and+answers+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_off0000e94d.bin
51e09a5eb801e8d2033a9e1980ff48a2180d244f95329ac5638c8ca71124337d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 17828 bytes
font_01_sfnt_off00011870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16792 bytes
font_02_sfnt_off00013087.bin
42dafc4b73907bbcb6cef70408219495018a1c601c56c412a7f71389dcb78866
pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 10876 bytes