Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd6ecec85e02a5e…

MALICIOUS

PDF

88.9 KB Created: 2021-09-16 21:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9c5965256ee413275d9486560ebadc32 SHA-1: 070264add456cbc5c57bd53784529f1a29cca367 SHA-256: 9fd6ecec85e02a5e73d9712dc2f6186f472c71314bc9b62e4919c1dd79aeee6d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document attempts to trick the user into installing remote support software, likely to gain unauthorized access. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/uplcv?utm_term=download+games+for+android+mobiles+for+free PDF link annotation
    • http://dintainoodle.com/uploads/files/44403019691.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tobuzudebafidatovu.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/13059717194.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/kivitapivipom.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/66024924576.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/87708089048.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161402fb00f076---13458603654.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/xamujatodofotibexu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/43945733929.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gagizowatexanogal.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/20e51e383e41d6df18523658408d033f/64077400335.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/fofimikarexubiruvariva.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/34343543928.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/befexazexinenimidifabu.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/35696841821.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/woxenalukurofogo.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/51759839971.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/42439159131.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bavimozabeviwaxe.pdfIn PDF document text
    • http://wsm.hk/images/files/gojonenagubexovajirefu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613408f371cb5---walomazezevezobij.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/kofokebomagedimesuzixat.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/70589451345.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210916222831.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_off0000f67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 18024 bytes
SHA-256: 13df39bdd9b022a0e4a025912f52b8de19000fdcabd4d657aee686bbc0641deb
font_01_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 10824 bytes
SHA-256: de708fb8e1d9022510ae1dec26574027e614526d4210c8c4fcee634eb6dfdce3
font_02_sfnt_off00013da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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