Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6555f80495713da…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 08:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 69aa48577b337b8265147d9b30340f6a SHA-1: 1a65daeab88df2f702090131ffbd8b080b4cf4c2 SHA-256: e6555f80495713dacfb1b447e9ed72f3a8891b6401a1c271b6ceb49251aa7425
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd4e93bdc---jubusipupataburegirujoma.pdf In PDF document text
    • http://voijin.com/userfiles/files/73019441576.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/kozizupokizoviwulodiz.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/xaxozizufujevumero.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d249c44ba30---wokopunisab.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091be94bcdf4---lixewosamaralediwigewevid.pdfIn PDF document text
    • https://petek.biz/resimler/files/11291895350.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/451559b712e22b6ae7dd83d968e15fb0/23337162615.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074303c906e6---57235291155.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/794482208.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/tivobitevamanibiwokiwoxab.pdfIn PDF document text
    • https://anfauglir.com/images/file/95838951227.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/mabiresafoteruxojuxuxike.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01513b9fea---poxitusajagutiziped.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da0f578ca47---jewigadimomujefejev.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9836dc75---gijuzepisomupagunewo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084424e4a914---vezidizodejeromebeko.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f0bh3nfvd1f49fussm5eu2ruf4/ziredazabu.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/sasarade.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/52140234837.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/72112787705.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m6ec7c6ejkttpeh2qsv5jangr7/33351609518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adhd+test+for+adults+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA93 10480 bytes
SHA-256: ae467c1972d6f8a07419948a596c8f91b4755b5a77ba3221da87d33f8cacd068
font_01_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 17440 bytes
SHA-256: ef0c51e73ab2a59e97633bcbaf2fe551037714cc7e6735062e1fb765d3bcf99d
font_02_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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