Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cae13f9646d0cfc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 01:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d67f843c36767071d698d2b35193bb2 SHA-1: 5e8252913a2bd307e835870772621e6cdf4a2ddb SHA-256: 6cae13f9646d0cfcc927b420eca7063da2d823f6a3b6af763ffbe7e281c4eab5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=gpm+goulds+pump+manual+book PDF link annotation
    • https://beyondpins.com/calisma2/files/uploads/71398632057.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/4558074159.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/53673224040.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/sijum.pdfIn PDF document text
    • https://aokman-drive.com/d/files/kixafunawobusizitetewe.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/mugasopubir.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04153a22cc---tupekifezoku.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/lirajakituku.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9f218e72e2736bb40a027dccd9274cc3/90293988320.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/04hcji3ieiaa5ls5glqeu9t9fq/topaxopokasawafomose.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/90032443393.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/xepirexukasa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160870fe652655---13110918195.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/mubunokipugobuvokipowun.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/64569822217.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6f1159f6---fuvokamofumunoterafitodu.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/takedosuvukoke.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l35u7oioo0u25a2b8v8nrbab47/depukegalepabefagotik.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/sazolemurepa.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jopologelawum.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nepuganuxave.pdfIn PDF document text
    • https://architektor.ru/uploads/file/15477466921.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6571aed4e1---46068411750.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_off0000c8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E8 19532 bytes
SHA-256: f45c5271a1a5a557ea6a792c5a7795fc075f32f68fef8789671a2ee58a597683
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 10684 bytes
SHA-256: 4fb1ea8f633540507fb8d0b983e543f421a91d800255cc0ee53d5985f2027962

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