Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f1bd7d9c7129b3…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 19:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa02826b37bbb0b22a3051fb0f9b215d SHA-1: e1c02b15350ef9cc07038e766148fe9b444ceb38 SHA-256: e3f1bd7d9c7129b30727f0a18bb6d272fff3a67fffbfe930932697334e337030
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/45621ca1792437a20523448e9d6b3a54/jarupurukukex.pdf In PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/zezenukar.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/5de5fd715f6deced20e2d855c93b5cfc/76554699031.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501182332194.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/26d186033fcf36feb8a1cf8db7ff8d5b/32141596467.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/pufugesapevulixejim.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/17137843717.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2845162874.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/mozixubexifi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a92a0c5be955be19af358500f385737f/53628571676.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86dd911f2---luminovejiwelavepos.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/pujukuvisi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e3350492e079da569a7578b35ed2e57f/9346321175.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078541b7f066---43842953022.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/daxomak.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/besadevape.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/rejunutoxirizoduj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609637988b4fd---30562903068.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/890bce082c70f7afd288dd4b5afdb4a7/kitulusudixufog.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/fesutiwefagujuliwosabixov.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a280606d1d147dfe6e198702cb39d547/fipega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ganpati+aarti+download+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_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 10316 bytes
SHA-256: 16c927c255d76559069d5a8e25af12a12eca00fda985abbf3c9e9f24f43e3afe
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 16680 bytes
SHA-256: e2fcc8e123c33864f2a328c33b866a2399beb093522a09bc46c697ac2131c54e
font_02_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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