Malicious PDF — malware analysis report

Static analysis result for SHA-256 a896a3acc2e7b9f8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 13:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f381c91be7a297c80aa28a3d4719c45 SHA-1: 3f4e4be81ec4fa220e074cb66a06da679b40e1d0 SHA-256: a896a3acc2e7b9f8a71d4d785f16775af0ef2d50008187a4ce8a5f6084581d6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised or disposable domains. The primary function appears to be redirecting users to potentially malicious content, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://patc.fr/imagesfile/24741996691.pdf In PDF document text
    • http://eventologia.com/userfiles/files/fexowex.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a792487071---55068627480.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/radigigugujozinuwujewod.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/volubawiloli.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/86855373648.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/rudenu.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xufonodaxudubokamojir.pdfIn PDF document text
    • http://dsraxys.com/uploads/faxinurajabaparenunuko.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/garovu.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mewifijabimadofefatuziku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b517a5d28---momolodusumokovesedis.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/12217642506.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac23b202b---latujabisivibaduwube.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/10663138528.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631532741.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/48855301342.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/nusomaxozajimokurizam.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/78385595164.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/votide.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090415184288.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/xojujasabibiruzonit.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/rejijagewopugabarak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+install+android+on+fire+tabletPDF 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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 10732 bytes
SHA-256: b084adcc1fa8d2da05498e4700adf53ebf5d68b169bf8b58258f41e561181a8f
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 18604 bytes
SHA-256: 9a4fbe5598b1d3e36d05385e7b3a23613145f7818640ba4212879193b868bad8

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