Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ef19fb75d6ebb6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfd0cb5ab7ced6cb97077f62dcd1d2da SHA-1: 100ce099d216b4cc08958e139f84f6baa60eb6cf SHA-256: 99ef19fb75d6ebb656f2dee27e3f282eacee606022134c05b3e22b131fd64f6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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 68 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://xn--49st2et51duvk.com/upload/files/21595799399.pdf In PDF document text
    • http://canphantich.net/Images_upload/files/japisujemixodi.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/64140929161.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc91ec52f0---wezawozovebizitevepidow.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///3118004574.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210913_030317.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161397827c7e21---wasazebem.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/60942532617.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/vuranejisefaxudowisolidot.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50979848462.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ogjphk7sutpcq4jfo0gsd45p4g/xuliluvivu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161497465e1dc1---derexilireregexiwuxanosub.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/wesotalof.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fimipuxepenatenujuraxi.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/wupevelibemogu.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/14661187353.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/51546101556.pdfIn PDF document text
    • http://besteva.com/upload/files/23278800355.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b83c8a40e874909d57733e37d5fd3f80/79053075851.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/88011598674.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/gafatusudivev.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24500763847.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210908092538.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/65599272874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tubemate+3+apk+download+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEED 13908 bytes
SHA-256: ff9b0939c013590a78794ab49e9b169ef5cb83252d5097bd214766a28a6ae317
font_01_sfnt_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 10988 bytes
SHA-256: 2949aef0c2fe260e5253a8709ddce36da296e0e6cf8df62aa06a165d6339e9f1
font_02_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1