Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4bfa7f4dc0bf84…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 07:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: eb55fdbce02911ce788834c94b4c97d8 SHA-1: e89b692213eec89f0c6f92c45e6f16edd95424e8 SHA-256: 3a4bfa7f4dc0bf84d062bacca5bd26effc34dfbf14328f8ff763b181eb1b107f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to external PDFs. Several of these links are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5210

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sportyou.fr/ckfinder/userfiles/files/tesepigasixojejibosiwewo.pdf In PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/tevavujevasadaruvejijipav.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/tixusejerotuluwojagu.pdfIn PDF document text
    • http://birdwatching.sk/media/file/33313465755.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/61515348612.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/54569561055.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/84298157657.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/34324859884.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/rubuxivudarusit.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zopekuwojazepepije.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/15dd07508460a6ff4379704271823abb/48264872792.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/25327052729.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/72882194446.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6irh2iksghrjkjtt4c3jaoe056/7752985167.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/sigexi.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/95674611984.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/53702544902.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/98585138160.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/22303398092.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9abbbcd75b5c2f6903ed88e8f0106dd8/84174258211.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/2688086938.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/60964256443.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/ginaruvedafapowob.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/lekazazitala.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/budonamozobewafevegosorup.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeef711610---sorazarinuwowowenefo.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rufixukewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=justice+league+2017+full+movie+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 11080 bytes
SHA-256: bdf0d6f93e17793727047c9d84dec66b42a769af5867953c295045399f296567
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 18304 bytes
SHA-256: c288b5928517b1b4383bc8f692ecfaefb1ed2d037dce290978b47eb03a8c4e88