Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c62e40fa5d83c9…

MALICIOUS

PDF

101.8 KB Created: 2021-09-06 18:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c8d9913e15a0c93908de4bf0cca7b2a SHA-1: 47dc0067eec90d97cc87657d655996559c601d91 SHA-256: c1c62e40fa5d83c9d9e403821764c8630732cca37d3ab4b1d38c482e387a15c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and numerous links suggest the PDF is designed to redirect users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=escalonamento+de+processos+pdf PDF link annotation
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/038f58177baf8110dfd1b5976178ae4c/wurifopuxod.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e0977bfe374fd506f4af64588d90edef/58955228578.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/71182890939.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/83146621451.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4434e056db---13836894424.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/wibafanemiz.pdfIn PDF document text
    • http://df-2.de/images/daten/file/gujemim.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jidodisowozuvomerapugan.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1cfba5db3---19889159271.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc35a628ff---15760813829.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/41149548832.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/618629addd1d55e5a8011ca072d37709/27546637052.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/59bae48fad8bd1849b73bf8be2ab2cdd/zokexugezexapesesuraluf.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/37426071297.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/38209368196.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/jatibedexozefedunisoki.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/togosezoviguvisurifo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/30521435220.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/bdd715a3bedf183a63ac6b059343eeaf.pdfIn PDF document text
    • https://iwistw.com/upload/files/33928641482.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/70345417760.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361bb7e8f61---3673432012.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9dbf93977---79274048607.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9db80b3dc---luwuxegotabetuxowe.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_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 22052 bytes
SHA-256: d71429256cc949ac192c9ba295982e7dd382f9aa2627c77267662601165f312a
font_01_sfnt_off000158cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CB 10672 bytes
SHA-256: 646d3683b9debf692c4abbfc7de26d91d2712835706b077ef020aa71e3a38c41
font_02_sfnt_off0001713c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1713C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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