Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9b0ca32e78be66…

MALICIOUS

PDF

152.8 KB Created: 2021-06-19 22:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f666a0ad111f88665302c2a9b1b3cdfc SHA-1: 0135562fec4a0ea04bd897d0be9355093084f12a SHA-256: ad9b0ca32e78be6648c3a95dd59092f1756045a5d8caaccdad3704b5b5d50ab5
136 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various PDF files hosted on potentially compromised websites, masquerading as a free download. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests this is a common tactic to bypass gateway scanning by encrypting the actual payload, which is then intended to be delivered after the user is tricked into downloading it. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wildpflanzen-planung.de/file/48164769205.pdf In PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o5uqhlkkmct5uq4rl9a03jgcgt/zozozeritamebe.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607422aec57e5---64716233444.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c637a31d---80582428337.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/tanad.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aedhb22p7dkfb1dk98vslq0d97/14189618210.pdfIn PDF document text
    • http://siembra.me/uploads/files/19520063415.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ebb6be57---5237312335.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160710f11ef0be---33332668235.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867dd61ec42ca73abdc396b2cd15f9d1/fisipagugitavubakipo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b5fdf191---zosanomemetafako.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f22532c9---39385245983.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c321f9ea8c3---18436101106.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wipezovisasovaverizo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a843a90658---93965447144.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec41497a9---39583076525.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/69178014440.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd2adc68d---kisoxewuduxuk.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=nostradamus+and+his+prophecies+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00024278.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24278 5004 bytes
SHA-256: e89f55d6231102aae430bbeefa13d281d19b3709b2667ebdae36cb36662de4a9
font_00_sfnt_off0001cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB42 4404 bytes
SHA-256: 1076941684d5d24f69e42b502368002ef96445e246c21b5af9f345449b419ce7
font_01_sfnt_off0001da9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA9C 5456 bytes
SHA-256: 47b4403289bfa0dda4e489a1c2221e9b60a07725be1b2ee2635afaaa7479e9a6
font_02_sfnt_off0001ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED1A 17720 bytes
SHA-256: a6c4ba2c55ce973e6178fd036ea6f321dcb7c7bcb7e5bec7ca0374ff81f111e4
font_03_sfnt_off00022308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22308 19240 bytes
SHA-256: c130603100be8e83bd5750a2b81fcd057d6441186b6945e5801e6b92560c909c

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