Malicious PDF — malware analysis report

Static analysis result for SHA-256 efadd2d421c95fea…

MALICIOUS

PDF

63.7 KB Created: 2021-09-17 07:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72993f0c8ceb5a093a50118b12c34d0f SHA-1: 3d4e6660d5033e9634a4bd233d82b4350f1ac9ec SHA-256: efadd2d421c95fea3c93e90002c42ec0cd5bf6c3c1e2b4196ce7c4dba428ac80
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting domains, suggesting an attempt to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7597

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/71791979234.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/bomukidoxukuwikurex.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161435e8caac96---64885001518.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/85102834863.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fetevadabegosof.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74fb096d87ed9701004bdcec6fdd4102/mabudebatuseguxolufevesu.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/ziveb.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51351184965.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9be9de8e---gujinad.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/34837863299.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/45326608058.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/favaku.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/wamoroj.pdfIn PDF document text
    • http://autovoda.ru/upload/files/77139387144.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/jewolavudet.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/sedajuxopir.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/nukezokumopopixowil.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bowigazusa.pdfIn PDF document text
    • http://deforma.it/userfiles/files/gogudomukomositoxaluxa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141df0088e1d---2731204534.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/sipoposariwizivasa.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=flutter+development+without+android+studioPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64ecdb8f95a283614f29b91cbe53ac9d/pobifokazepebonaxukomu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10884 bytes
SHA-256: 0672eeeba3ca7710e7232c3905b2a2d9f9a2670cddf32e4e67dda5b7c3ad0600

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