Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0298c72d9a663d…

MALICIOUS

PDF

147.6 KB Created: 2021-07-27 10:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2579e64e608537e69ddfc79aaa54a74 SHA-1: c34d1f417734a49b1802d4b689ee7271f836fb65 SHA-256: ed0298c72d9a663d4c711db5be8e99a65603d876e14fce1996ffb165043e139e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm pointing to potentially compromised or disposable hosting. ClamAV and an ML classifier flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7935

Heuristics 5

  • 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
  • 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 http://iaestedresden.de/userfiles/file/nafupugoro.pdf In PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/6977950748.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/bb8ef4f1a9b3b18389612b8f50179d36/fijesusebamisabe.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ip4bnaa3r1oa71m0v92epu9912/38528965316.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87dd6246db---wusivogijeluvorugaj.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160878191ad303---nilov.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085159f2d736---80451027268.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/jedopereborawepagikukowo.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160833240c7656---20579977625.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/092fac95bd4832011ba8f713929cef45/10935100958.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccd91dc88---42902994946.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210718/file/16265706424782.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/446cd130a6514618c507e440a7d25e6f/31293211755.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u03bn8v8o90tgpne948t1ufbpq/rixidesudewaf.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f908dc7bfde---303946273.pdfIn PDF document text
    • http://alltechsro.cz/files/15067224967.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75875a59d---lizaxivixenesudidodizakov.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/dejilemesopoj.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/pixewubidarodemilosebi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bvksvmfcfilclqa6lgfl47ccbk/26803017569.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0a68ad827864a25da902e664b8f7fb14/47029765219.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/muxekojapewefow.pdfIn PDF document text
    • https://ekransamara.ru/files/xarogumexodixesusib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=admission+form+format+for+coaching+classes+in+ms+wordPDF link annotation
    • 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_off0001e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E377 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_01_sfnt_off0001faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FABA 17360 bytes
SHA-256: d52ca1151cf9fe5351907f703990a2bea533c6dbaba14ab9ddaeb6956c0062d6
font_02_sfnt_off00022894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1