Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aa55943df5da42…

MALICIOUS

PDF

55.7 KB Created: 2021-09-19 02:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30a2cc838f105bdd925eec2a435849c0 SHA-1: 05638578c169f8320f3300bc161417e66334ae59 SHA-256: e9aa55943df5da42908e2f21891f8f53771ec1956e5fb9ec2a3dcb6c1f8fdd20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier further indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external links and the overall heuristic firings strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6436

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://chcial.ru/uplcv?utm_term=rainbow+six+vanguard+apk PDF link annotation
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614162538b66e---43872633133.pdfIn PDF document text
    • http://exima.kr/userData/board/file/vibegozasevazogozusizes.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/15602517334.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/93090040679.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/41850319962.pdfIn PDF document text
    • http://iucecb.com/files/file/1408907440.pdfIn PDF document text
    • https://eventaipei.com/upload/files/35409833671.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pimadusuxitenurisija.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/tisowojes.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/rafetopa.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/16679971797.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/dejobopanim.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efbfd9f99c---37507961480.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/16839339265.pdfIn PDF document text
    • https://hsse.cl/files/fomelov.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/sukapitegilubegi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2286b277b---32644383286.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/xagugamenuzewolufu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/43371361721.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356c42117ca---dejon.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/9441696810.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/mutumebet.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/roxovuniruvunolodome.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/gowajebesatakafato.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/72544897341.pdfIn PDF document text

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