Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d7d69aea870416…

MALICIOUS

PDF

80.6 KB Created: 2021-07-03 06:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9975e6fb8c9a1775973650dba5f51610 SHA-1: 8ef9c3dc99994869400e31b5683a1937e070165f SHA-256: 01d7d69aea8704163c0c4d54f996b9e62a70cd7cb6014aea1fdbb7f97667da5d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and an embedded JavaScript stream was detected, which could be used to further exploit the user or redirect them. The document body is heavily obfuscated and unreadable, providing no clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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://5m-tti.com/uploads/image/files/wegiwax.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c486639a9---folagaxu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iccq011u1p6duavnr8e71bq150/lenavitovebenajetasemegex.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160708c9613f60---29291356271.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442ce0250---tepojetukap.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/82289557151.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/v3u4re8q4nac5blbhj1tbbpp68/rimudumumuwik.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c1e453c6---21344376760.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jbg0oggfdonbd9qvf9vag94662/87908647918.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7d65b9ad---10234236047.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e7442e5d---53556556410.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/298d148390591f54e44b17a5a53da8df/32177365231.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/43651298295.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c8af11eb598e42ef9c9fd27750d1eab3/ridibasavobukezaven.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/7219751700.pdfIn PDF document text
    • http://deltools.com/userfiles/file/gafebade.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/daguworipulubajope.pdfIn PDF document text
    • http://berbun.com/user_img/file/lalaz.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wugopozip.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813455076c5---8319089654.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/5707632393.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/25225801081.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160860a117f256---7322982478.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f899f6da9b---80493249762.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/78fdb59bf986441c7b8ec637172a9cee/70638217355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=assurance+meaning+in+gujaratiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 17780 bytes
SHA-256: 24caf85a423a11b3507e1b61d4f513dcd8f7d4234bd0ac144c8d2e1ac6855cb7
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 16100 bytes
SHA-256: 7ac375ee3f87dabf5a8aab9ef66de401914e669ce569ae72251ce3f3871ecaaa
font_02_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10616 bytes
SHA-256: 09125f65af3ba4309ab98aeb2e39e93b9aa730fcf5d66aafcb7e26e47226449f
font_03_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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