Malicious PDF — malware analysis report

Static analysis result for SHA-256 23622b6ea161dbd6…

MALICIOUS

PDF

78.5 KB Created: 2021-07-07 05:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3dd1c1703a62a53df313791454c42835 SHA-1: 22eb054adbb439fd554862303e5dbab54f5f7259 SHA-256: 23622b6ea161dbd6d2a0f1cce8903a797fff830f650760bdf3cf28419a77afbc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The primary purpose appears to be redirecting users through these links, potentially to deliver further malicious content or engage in SEO manipulation. No specific family is identifiable from the available evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crewmak.ru/uplcv?utm_term=higher+drama+performance+analysis+essay+example PDF link annotation
    • http://webursitet.org/Files/file/61729301148.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4a310f72---84825476388.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/91600365176.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a55f4ad0e---duzofijumelaro.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160811d4fbb091---6371194467.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/bukalenukimirukazol.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/db03b2c1d2edf79d9028935b56fca38c/towapidezazugur.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/popazalitopapa.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/18238572290.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1p7hgid8v0i120al0ftle2dvm2/vuxubaxakedunuxezewuluw.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/57af61e7bbb66e930ae17dc8e8b3550a/sekab.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/12024720625.pdfIn PDF document text
    • https://asi-filter.pl/files/file/47643439511.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///motanolipowo.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/26329224534.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/pedarotirejarerujudo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084404fc9890---15129463968.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf80164032e---47684918550.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/26911374150.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/26644261512.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/gvkbo538s5q7746000f44o9e9f/tujinoperoxovidurotinuwut.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/11203794204.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a0l2dd3k1lr05biu7pnh317k76/numerawun.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/18472042266.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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE943 15980 bytes
SHA-256: bf822726047f01481689dce55993b76ae7d1b0cfcc2a8bcb83be3b8cedb854d6
font_02_sfnt_off00011292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 11176 bytes
SHA-256: 788312673669dc56c11ee62e3dae5f68392afaa6e401319b30eee8e2668c3a89

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