Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ab89fb12b23da6…

MALICIOUS

PDF

89.4 KB Created: 2021-09-11 05:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8e23fb85b5134f3e2195a1924392268 SHA-1: c26819df60fab7a60b2a29aeebab9dfb377a3d41 SHA-256: e4ab89fb12b23da64742e72aff3cb8178c11a281aabb5ae9f22dc75737fc1c8b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=harry+potter+reading+comprehension+worksheets+pdf PDF link annotation
    • https://photojet.net/userfiles/file/sinafenokagiferowepavuxim.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613b51cb10e1f---basilutivurugawupu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/63630505914.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/gajakit.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32498981414.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/mapodan.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb996616df---fikifopexinem.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376b0667adf---mivexedopalijex.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i04jkht0ps47ucok3e8ck28bk6/93168002791.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8255907523.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/pimuderig.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/pubixotapofatazije.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210905_4584FADBD236718E.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161350b66a6d48---nigiveraleko.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/wenonovaxar.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/29515909278.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8ce60661---64997249000.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/85234677489.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/tusosovog.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/mojawedoxadubidufam.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c82939d05---48006861040.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/7451196430.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/51580292229.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/pebovesukufufewovoko.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/fikikapuzitewijetitefip.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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 18744 bytes
SHA-256: 62a47b7d2ba129cd9aafc365d45e1694bb3aa3043ad95b27015b60447b592a6c
font_01_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 11304 bytes
SHA-256: 994149a44ba68c37a0bfafd4fc1ac82215aa6f7f333babcfbb2ad88ebc53ab02
font_02_sfnt_off00013f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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