Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb5be9c814c07c9…

MALICIOUS

PDF

62.3 KB Created: 2021-09-19 20:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25caf80084c1685f8dc2edb997016b07 SHA-1: 4a00517a3fc70c369811a83f7503ad2253cc5e82 SHA-256: dcb5be9c814c07c9b69c856a07c393f8fe253249e871d7d898894417a01e70a4
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on a compromised WordPress site, suggesting it's designed to lure users to external malicious resources. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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 http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161382912a42fa---27885721407.pdf In PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/78566709973.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/38f17329c255944a475ffbf73fad250b/49177826499.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/nosoxoji.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/52310123669.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/31862247155.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/69971466346.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kabafuv.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/vikalodev.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/nafozigoxuzone.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vewigesuvomobabuxe.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/tinimolutazoge.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/soposarugidilinepiwenu.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/70343875800.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/8710667341.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tuwituvizikejovawem.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/75774186469.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/73936100758.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k777mp1307sa5qlsq21v8ek90s/junejefe.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_11_07_08_59_8801.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/51926594545.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/nusuvuf.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/96043393784.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/28996956147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=re+face+proPDF 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_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 10012 bytes
SHA-256: caf79366363fadf1150a9d285985e76d810707106c5024e0cb31511ea63459ef

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