Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb39ead9c03a3dcc…

MALICIOUS

PDF

70.3 KB Created: 2021-06-11 00:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d508d3a3a23f958711edbbcfcc022e SHA-1: 1038f0d25912c4b3456285ffa396d55353f60a98 SHA-256: eb39ead9c03a3dcce822085384e2860c7cc7fb808a4bfa201f03fa10acebce33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to reference a calculator, which is likely a pretext to drive users to these malicious URLs. No scripts were extracted, but the PDF structure and link farm heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://philabc.ru/uplcv?utm_term=ohm+voltage+drop+calculator
    • http://dobrasekacka.cz/userfiles/file/35932456117.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c670e78---92852963232.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3jhfuhigtu91egnuv5cj9q7fh5/28090562208.pdf
    • http://tokyoto.pl/UserFiles/file/13918506749.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608637788020d---zurulaxuka.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3b7e5a9316ae42a1cb77309b292e2f21/betubazetinopifudeb.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5b1f66cde9786fd95c53d93b591bda24/91140370617.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3rr9k4te4hl6m4s3g65t1mrinf/56554082102.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdfe93f140---81564856802.pdf
    • http://villa-carlshorst.de/sites/default/files/file/92089793840.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22c7bb819---75884039014.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/oac1j654ri1l1insmo26576r7q/83227558708.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4j7sqkg5gn7flafm4uttstalae/vodep.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094111073479---penukafolomofalujonaputi.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796fbd00785---15772998221.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd118f3abfa---wekezewolewekaxuvuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin
eec26e881b9aa8fa6b3adcc3b9d944f0da757b28a2895513b3337c54ae2b98b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 5124 bytes

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