Malicious PDF — malware analysis report

Static analysis result for SHA-256 e223dedd641e3847…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 11:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a116ed3eaf07101ba18103c92a1930ed SHA-1: 318620d8399db838df57613aa092178314d54e73 SHA-256: e223dedd641e38474a858a83197f659e34b314461b12aa2aeebcc38ea06ecc2d
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains a link farm pointing to various compromised websites, many of which host further PDF files. The ClamAV detection indicates it is a phishing trojan. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the malicious intent of directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6122b9bdaa---63837248226.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/47441663262.pdfIn PDF document text
    • http://fygl.net/uploads/file/101754186866.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/nasedejizufovitewal.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210724_082253.pdfPDF link annotation
    • https://888nv.ru/userfiles/file/38777921536.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6690b1d04d380a8963706be968ae1aad/xiwekimoneseravibu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d91bd4c30775e4f8e3f409a60ba5399a/vobifikanifusuniregej.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dd6d9f36---buzopusomivusapemid.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/sekixusofe.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/wixebam.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ea993571dca98fe2c30ebba96d442af8/31338110893.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/93388563414.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kg138mi767tpf0pnp8pdta6s52/53023780681.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d480c00b2e6---29382840651.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/fezebowavuxe.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/70092712778.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160767ab88a823---nafezixerazibuxuxevedug.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/51485857720.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/9594653405.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/84064529314.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b6379d9b2---dorifo.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/54077864307.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/ludaketu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=advanced+english+arabic+translation+pdfPDF link annotation

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