Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea90b1d5b63ffa4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 14:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73db1d09d7f4098591c5d6c647b18980 SHA-1: ad8101f74a3316fc6ac87a8c19093a77b19fa85f SHA-256: 6ea90b1d5b63ffa4f42245eb1ef782a9e9ad38121dfa03a8f47de1d11b3e2a1c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious files. The presence of a 'download button' lure and a high ML classifier score further indicate malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely involving a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a1384477---41016832406.pdf In PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210708_14E02803AB91594B.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/gapuw.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/44333538555.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/27184454684.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/nefotixogogona.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18cb296f0---womarosikotezafa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f44e9d570---sifuk.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/88063566593.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e1tdkom32u9o822klhirdac03o/sojofi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rt5b194e2cjs8langvmoqacl63/15412785383.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1cf8e077---voxuluzugereduvegi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c90a0b26845249a3f3aad2d9c93b877d/funituwebafakokoxo.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce6f0cf108b7263e559e298c9e43f936/polejugano.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/zurokuxumarogikojetataliv.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/totopegadugud.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c345860afa3---73090134721.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/bamakomovebupunabifi.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kivineneguwabofajojabawev.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/62712393167.pdfIn PDF document text
    • https://drsaman.com/files/1346752781.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b934b9e5b5c---8977443711.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/44634206290.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/909333158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=intermediate+chemistry+record+manualPDF link annotation
    • 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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 16964 bytes
SHA-256: 50c78494d8abc5fc2f103c212ca77ee7f793d77d39825b3f5e15c42fcce866ff
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 10800 bytes
SHA-256: 5812d480febe4ce5f3dd69936450e1fcb8686f3453f91c5a6a1c66a0d9653ba6