Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd23034c54442e0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 16:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3814d82cf417698416227199fb0d93ec SHA-1: 66cc2c14c4ccac696324632b47c4ad90009c5dcb SHA-256: 5bd23034c54442e05478635ab10370807b600c6d5f4ca6fed6fd76b0d3aa946e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains a link farm pointing to various domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic further indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3554

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=audio+booster+for+android PDF link annotation
    • https://hotnewsmd.deca.md/upload/userfiles/files/65164319541.pdfIn PDF document text
    • http://warehousetraining.ie/images/3650576778.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sexukalusabevonelus.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/zozidor.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/wanovuxezajisevedeje.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/siginovat.pdfIn PDF document text
    • http://skene.es/userfiles/file/76179245334.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446c4e7cef1---tapegizamibefajomid.pdfIn PDF document text
    • https://digireg.lu/upload/fufiv.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9086a3ef8---78085022347.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/41144817861.pdfIn PDF document text
    • https://sanagustin.cl/files/21554692958.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/21678970765.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kalagesumeral.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/38534139628.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/89819892259.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0bdeb30f199bf699e7a3197cf3a0c323/sugipede.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/14958777210.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/22097401568.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/56193249592.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/fewakogasaxasekanegevare.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c2892dd311bad31d2d7d304caf5ede75/55316597891.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/dedusemit.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kapenudunebinitivofej.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/68463519061.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/dudepufuletopugalirini.pdfIn PDF document text

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