Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6510cb6d78e7c3…

MALICIOUS

PDF

42.8 KB Created: 2021-09-27 20:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7dc6b3bdde46cd0533eb59a8a74d07b SHA-1: 561dd9d6e3ff6ce4d167a4b07023455517a576b2 SHA-256: 7b6510cb6d78e7c3c1fee28efb0d6efa536a89b755f7d0829e9ff9e71e51b245
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7494

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=boruto+which+episodes+to+watch PDF link annotation
    • http://krokodilok.hu/_user/file/nuwowizesovikude.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/10168527162.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613755d902d69---lekalalasawaj.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/barivarikakavip.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/bujok.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/53649364210.pdfIn PDF document text
    • http://learningkey.org/userfiles/70357933865.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/40757492f35c94d2eb938003bc68dfc6/76799487630.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/dodosidiradujuvemusejekap.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/24328921170.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6d8eedc1---zowowiva.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/selajiwi.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/vuwuziduxef.pdfIn PDF document text
    • https://orangerun.re/photo/files/fumuxoxojabomigeburomowet.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4441598903.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/pozobiworetulezib.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/vevotegolagaguluxivu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///mebusexixumeso.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/99800191308.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/silivogezizogok.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/5353041944.pdfIn PDF document text
    • http://splogservice.ru/content/files/73969220399.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/kaketozavi.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/sagoselik.pdfIn PDF document text

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