Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf985309fa8c1593…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 10:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6228494724db812bcf1043bab3edb52 SHA-1: 3145da7577a6fe7ae0a95da96b287ab6f7257ac3 SHA-256: bf985309fa8c159345e137b6e520f8dc31220cfe57137acea092d5fd68e8b39d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as a lure to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613639c624349---koligidojaboj.pdf In PDF document text
    • http://unewstoday.com/task/userimages/file/33112546299.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/83561453217.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/83965647234.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/35838016104.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/karuzaburow.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/bamoger.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/ritetowiwet.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/rakititanimufevovituxu.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/lobovanulifojew.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f3fa1856ee5dc7b3b96c549064311a39/zamogosexunujuxosababor.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/winigotutufovedijesa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d294291c8---49952258096.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/fudoturivemepatexod.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/masopubagagumesoralagu.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/6441866511.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vitiwov.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d1fba9503a460c7f2fdf77eadd8cf3b2/18659062380.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16147c9c760ef4---9279899029.pdfIn PDF document text
    • http://zae.me/datafiles/file/raboronotupagogogovi.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tewobuwafaruvokesotop.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/kedotakideroresokase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tiktok+us+server+apkPDF 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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 15092 bytes
SHA-256: 578546a6f29ff24088ba7ccb7e0589d9735a7c03180a59feeb483ec5a968f93f
font_01_sfnt_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10316 bytes
SHA-256: e55d14b6d10e98c315fa034f4a0c81621c4cb26cee421c838bd5c9402a5c69c5

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