Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a4f6e29e041c69…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 04:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6374bac6b81c826f6ef5c890f813f659 SHA-1: c759c2f5517012ff1e73987ee12bd99dd61e6100 SHA-256: 40a4f6e29e041c69c1b716712ba0fc2cff669a057f7e2a419a3d8a1925ee6ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=head+hockey+unblocked PDF link annotation
    • http://summitremodelinginc.com/userfiles/files/pibodugudubez.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1a9a9212bb4d0d5aec479e2857b6fc84/53786262693.pdfIn PDF document text
    • http://deltools.com/userfiles/file/fusamajunineni.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210911_FAD63E68B6381736.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/maburosi.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/27729350703.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/63281449831.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/84277287865.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06f5359a9---76850153308.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/85238766338.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/muredosejujoj.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/82313504200.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/75384653049.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210907130217_1267736295.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/65022368002.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/vefovujigase.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/97302019339.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/43704196374.pdfIn PDF document text
    • https://davaocarrental.com/images/file/57598427916.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1675ae7a0---nojogefanajafexavu.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/wozumexi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa74f4b239---zusonifirakeduw.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/31041964722.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/080648102369.pdfIn PDF document text
    • http://sinners-party.de/media/file/53277929772.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/62315645629.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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 17788 bytes
SHA-256: 5f94edfccb8ca00f545316a1731519329fd675319cefa39f9dcb4a4f6eba0a3f
font_01_sfnt_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 10444 bytes
SHA-256: 31678d37f1fe036c1d5259cab529e4f5e94db33f24afc59ba36b9bd35f016eb9

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