Malicious PDF — malware analysis report

Static analysis result for SHA-256 299eb097cd540554…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 09:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fd2a64eaf7932905dcdd4de4268e1c1 SHA-1: 2f9b53935c5a019b3f1635502e419b7e3789cbba SHA-256: 299eb097cd540554bd4890dc4def231831e9882544edd19ccffe54e45716ea4e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • 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://pistant.ru/uplcv?utm_term=bhavani+ashtakam+in+gujarati+pdf PDF link annotation
    • https://balbok.net/admin/ckfinder/userfiles/files/pidutetetopi.pdfIn PDF document text
    • http://azizolace.cz/images/file/19993308207.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/leron.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dmuotqcgvfur520t2vmmrjfmh2/gowagixewe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9988e55138---83321665721.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608920e43b1fd---38105406469.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/gamagavebu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/digamanekugakab.pdfIn PDF document text
    • https://termoformat.md/img/files/51969112393.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/33410221854.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/2196393102.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354df307a0d---torurobelebej.pdfIn PDF document text
    • http://yejida.com/userfiles/file/lafat.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/zuvabetixarop.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/sinonetap.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c0b25cdb033f1a0a380de2c8e791bd03/vanabev.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5c3d5453---risajezumixodudarapuxew.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/kogemitetadobo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/af5b2fa8a6fe2b5636fb5492a1c3d869/fufuwulox.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/40b040738e5d3c643fd9bd35232d5410/zetegizom.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/dosomozopixolowofako.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9dde23551---mowoforiporojewazonevu.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/luxin.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jatekikejokoniw.pdfIn PDF document text
    • 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_off0000b2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 11088 bytes
SHA-256: 1729bc9b6c23844eead3f9d64a2d56972ce8e425f3891a1e86b31003dde7f842
font_03_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 17004 bytes
SHA-256: 5a19a1de19ec8394424dab7d6123d216b657624d126a062f3c59ba137f8e9c8f

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