Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbac374af173682…

MALICIOUS

PDF

55.5 KB Created: 2021-09-05 01:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99b506e1a000cc85c7fed4641901f86b SHA-1: 8152109bcb529925e78c61f74069490d5d8a3d67 SHA-256: 4bbac374af173682de75dabf157d9e0462de3ede93dd3ca9e650c89212354709
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains an image-only design with a click-outward action, typical of attempts to trick users into visiting malicious URLs. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8104

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 55 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://solyaris.pro/admin/ckfinder/userfiles/files/kamubitorobabukiji.pdf In PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a01952fdf55786f767d28c503cc4943a/30914542886.pdfIn PDF document text
    • https://bloc-immo.com/images/medozopolexakow.pdfIn PDF document text
    • https://citytrafik.nu/images/file/15119881629.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/73819079876.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82a0ae84e---91894606077.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4df11e450b---jusowik.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/67206642977.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3uaesl2fbq1ko0ggc57d71qk54/bomuzivajutovik.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44f871f4e95d93e77eed948e690b4dfd/87935473770.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73501bcc44.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/kabawobapane.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fa50298f---88236100187.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/4031038403.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210819_080624.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43e46f41a5---36292892208.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/dofopef.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0bc53872---mesirulatosifilafi.pdfIn PDF document text
    • http://babamoleskine.com/files/file/sised.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ac89195c---50101396160.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fogozuxefivuwi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/nuwuxomirebiveluxig.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1u284lbuqcjqr5a0gom035bo8/vajiginazuvumunoxoposa.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/94274635204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ducati+panigale+service+manualPDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 14220 bytes
SHA-256: 9a1ef8b9eab642922068c1c78a743e81390a236c44e2354faca7b8a5742e8bac