Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea8c3a670ce734f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 13:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23f85f56ae19733347b0c127c24dd001 SHA-1: 3ae8a275f973049b58cb3357e55d5ba8a9945b05 SHA-256: eea8c3a670ce734f6f38c8b9b5a75f18ce824a27202d5aa35e4bd90ee2fd9e18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. These links likely redirect to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support the malicious nature of this file, suggesting it's used to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=christmas+screensavers+for+android PDF link annotation
    • https://nocenzura.space/web/img/podborky/files/difefitulomanelanolude.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b3518c18---40952456751.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/waxizuwifu.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/nugatajijub.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210916_25A429D35F4F0D83.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bda16a39be6e8508b7f51972ab392a88/fogepu.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93066987565.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/dupisetoz.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219495418.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/51022237721.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/1355528724.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/dapisutegimunenalevofuw.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/6607107655.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed3e6f7558c395c7cdec5c9366967378/semeba.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/futilofedano.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/95505783861.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/64950771946.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gufisopulora.pdfIn PDF document text
    • http://precisao.net/files/files/50353680890.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210902083100.pdfIn PDF document text
    • https://dhesient.com/media/92641474370.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/14731636016.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/70869076391.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/juxojewepekokuginexobar.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF361 10792 bytes
SHA-256: b4db81f8cc4aacae3250c1ccea3c44c06c26ab303d0d5e7af4af70241bd32cf0
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 17560 bytes
SHA-256: f639e9c6299fa3c5f702314b0071da8c126a944f2f24818dde1a565d3e4579fa

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