Malicious PDF — malware analysis report

Static analysis result for SHA-256 3444b7fb03eef91a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-09 15:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc75260c850a88d829787f5a7b3a3a4b SHA-1: 2afde3d2cefff9da4acadd56da6ae79ca9b01c2f SHA-256: 3444b7fb03eef91aa959fee34f54312c8c6de3ca1339125a8572f287f7901b85
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of multiple external URIs and link farm heuristics indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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 http://whitedwarf.ru/public/images/ckfinder/files/41632525717.pdf In PDF document text
    • https://snapstudios.ca/userfiles/file/jejanagasutenipir.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/rafujuberozideleritepe.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/36115681398.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf3f86bcb---90241482802.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/xagusiminasakuvo.pdfIn PDF document text
    • http://schokozentrale.de/idata/45692044213.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/13011980306138d6b15e2dc.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090517033076.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pinirivilumor.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/63682039458.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62158994---zupalakedunezon.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/34158256100.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382150caa0e---66384245871.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d81242829c242f34dea50b17be21d6e5/5826175383.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2f2243514fd1c93cda41f61eeac24926/valuto.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/bubesadoxovelinakunit.pdfIn PDF document text
    • http://linker-apps.com/files/44465502454.pdfIn PDF document text
    • https://thehouseproduction.net/file/49730528477.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/3985722310.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/76174058291.pdfIn PDF document text
    • https://badoza.net/userfiles/file/52779658592.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/40718018494.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqr14usv6qhkoc54mkrp5dqc3o/31513236780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=es+file+explorer+pro+app+downloadPDF link annotation
    • 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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 10564 bytes
SHA-256: 9c300c6de870e0a5400b7b54ecdb143076e323d9faf3fa25b75e24423e78570a

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