Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c97caadb8afd625…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 20:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 867746a59df8c5a348be2264e5ec934a SHA-1: ab9339100cfc2454504e8ed909cf31bb03dc3a44 SHA-256: 8c97caadb8afd6254390e64d0eb817220fc568621d9c9bfd5cfc18dc2fc70023
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://massarentearchitettura.com/userfiles/files/15882945245.pdf In PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4jontbl6pffdj48b3osus259gu/55498006472.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210620035144.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/5867627266.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/kutawexesarevufepuka.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/popalifivujepitizivu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/10/file/meniguwul.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/601n0rcp02dbr6o4cnu11904o5/zukixiligujidarevexa.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/kedijunujul.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/68650862896.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314168b380---56834268817.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/63976794331.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/da4b7b686c29883601199ef9ded05512/21443018999.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/wafukulenegoxeruxidisutas.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6fb54f38c73612e3dedb42fbfda0d462/sujezobezanawowurot.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1852a4a7f---xorulojobutujewetax.pdfIn PDF document text
    • http://efrex.cz/files/file/65700978838.pdfIn PDF document text
    • https://adium.ru/userfiles/file/zekefowuzamoxaman.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zitozamudasenavewi.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/vizeda.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab4cd297c7---40720254014.pdfIn PDF document text
    • http://rentaruedas.com/files/others/46568722699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=elizabeth+the+secondPDF 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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 10552 bytes
SHA-256: bafcf41ec92690e02932caaa73e807e7d11c3a496591f76cc73735f4d1128fbf
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 18156 bytes
SHA-256: 1552e5fcdc8c8e4b8449cb85999c2b6b15acacad9e1b97782ba2512ea3ccb2f6
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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