Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1018636418255d…

MALICIOUS

PDF

92.7 KB Created: 2021-08-17 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88625cd63f8b8ce1565362a88acdc005 SHA-1: 026bbf652dd45ed56826dd60cbf96586d55e9c8f SHA-256: ec1018636418255defb01623355ff5d5f5b819bfa3c2521cd9c5528381141555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=how+to+use+social+media+marketing+for+small+business PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ac981894a2540c8f139e9dea4e325bb6/jomevikajasada.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/74778954963.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/92960249123.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1665651c81a3156748c4d1f80a32c9ba/40964394147.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/xezumotopuzoberujezofuz.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/77300e585276a3840ec4fa07aa0dff96/45757139148.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/58611803792.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c015b5c49343f19dcbec9792429af547/22077866525.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0ca221eab3dcff1b13ac92d2635ae12b/88196924251.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/11626d43e72d58a54b4790749623cd85/16085036442.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/78877945540.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b6127a993---pegenaredozexopilinud.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68e8f3946a---lojasudijizumuxukekibi.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vinajesevul.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uncfqjoodn8oe2ot3jeid22r88/luvuwanakubezikidiripip.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b530c54dd---70523855434.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/43947414942.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/69463331591.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/85549417415.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/knnm78jnr753f27qp2k2sctjur/95991275194.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/4d939094f3866e18aada7ba95924ec10/93161313774.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/70047e76b4de0f32aceb08797f7d03ca/69878057013.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/5162247873.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/bapabepivabipilozesifemu.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/wowema.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/nijagotememojogadariki.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_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 11228 bytes
SHA-256: b9275a5323e59be6e07e06e4b522758e3b7faea37f0afe0e6adc1cc055c42fe9
font_01_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16788 bytes
SHA-256: 0b34bcd33d5863ee5b42fbb4ccc1e410f226b163c9d84ed36a86df1b0405d3a8
font_02_sfnt_off00014c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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