Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d936d7f7d1cad3a…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 04:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91c73be970e351d40b5592aa917d9f5f SHA-1: db81444e9e875d79728b01a37fbb3240f2239637 SHA-256: 0d936d7f7d1cad3aea41f275214ceb2dc3b7622210a57d353ac006a728d63587
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to manipulate search engine rankings or distribute malware. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=optical+microscope+principle+pdf PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/j858a3ul1e3echibh4p89l8oie/sazeduva.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160890e53f3164---11851769139.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b2e4cbdf---kezimixukazigesenug.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/badewobinos.pdfIn PDF document text
    • http://heureka-cz.eu/files/wadijo.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xanovaxejuvujudifuloxav.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9ac4efc2266231d23e66d3cc9f14ba81/vuxezemunirixapakowuli.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/u8jhpv5rm1cbco0d1tj2e21o12/siloloxigepisifuva.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/40557319650.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ln54jmi3cddkfdcppr928u94aa/tanoposovogo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/17690411146.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a13594dd2---60143552520.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/rafasoredizajavoxoda.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85f591783---nuvawaf.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608790895b594---90587192183.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/24652326cf3974f2f0ca879078ae04c0/64188459707.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58cfe3546d---zujevej.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/dafuziw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c645a6e91---pamimuragusulekeg.pdfIn PDF document text
    • http://iltorg.ru/upload/file/299006014.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa42bed3b---19476750244.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5711ca313b---vugokegewutiz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f5349467187ca27ce2d6e7dc10fc099/gilibimawirefodijuvese.pdfIn PDF document text
    • https://latework.cz/soubory/julugokugadezufuvito.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 10804 bytes
SHA-256: f65d793b8e378659076bf9364e4892115d00f403d38db33e467d8f969992213e
font_01_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 18172 bytes
SHA-256: 96f6a85c0c663632d2c561b67631b27587730f34d4760d5fe51d4507a4ede6cd
font_02_sfnt_off00015d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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