Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e39719da2e42478…

MALICIOUS

PDF

53.4 KB Created: 2021-09-01 08:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1e9f34b8605e36ab164097bb45f1d4c SHA-1: 6d2c80c836291eaf8a9200b7d0a656493bc75032 SHA-256: 8e39719da2e42478e955aa02688c5475cbc41f71a45846fb2f64cdefe8e3cdd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and appears to be malformed, suggesting it is not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8927

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=the+software+engineering+code+of+ethics+and+professional+practice+was+developed+by PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609433e30b6bd---75892320328.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/14a91f99f1d2f12abcf8076aba36dfa5/regafi.pdfIn PDF document text
    • http://hongdacable.com/d/files/vodasavopugo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d390e12efcd---68007622281.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/48620262378.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/73404542199.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/15527460510.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de774d2b0e3---7650672301.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ed355903d---91163471784.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/10608111625.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/29549071929.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gofisi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/velaredinum.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28b27b062---16805793759.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0462fdbb---53158878985.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/41542048742.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/74816201005.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6abbb51fb8---66556327859.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/fudotazizovipijigiti.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/55557770418.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/31510740655.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wifovulekajoz.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r04bmkoidf7q7rafmi0vkn97ur/zenukuwapudaliri.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pibonewimabizunobekawexid.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160749394e2acc---4452280409.pdfIn PDF document text

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