Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3f706e7d45e379…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 08:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c232795092a30d4f6708650807032e21 SHA-1: 5c6c2a7a1fa1cda9d0bdb6dfdfc9b8b381139567 SHA-256: 5f3f706e7d45e37904317242b14969b736b0dc7ae8dce4cc9ae2ded5236529b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple links to potentially compromised websites, including a link farm on disposable hosting, further indicates a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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
  • 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 http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/47682639944.pdf In PDF document text
    • http://fotosvatba.net/userfiles/file/pupafemimemosumuf.pdfIn PDF document text
    • http://omegaplus.bg/uploads/pages/files/22812142012.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/11834926567.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/90595774606.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bonofadefu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n2umfsb3gctisdkpg507kpvi64/wexaguxarun.pdfIn PDF document text
    • http://all-premium.com/user_file/files/fafelomuwuj.pdfIn PDF document text
    • http://strap.sk/uploads/file/94637149651.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/74405582523.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/falatujilev.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/um577jnhpgt99ceih3s11urfl4/rujekatepo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/17842684491.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/50151197781.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/81697833346.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614400bd0a789---sidegovifo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109141647249031.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/76518337997.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/41169440067.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d531fb1a04---zutaxovilizujivopokurul.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/bedilit.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613decc889fb0---7591504265.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2825976b---zevabimez.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gukevimogarovezap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+los+santos+apk+downloadPDF 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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 18468 bytes
SHA-256: 11bdf60bfb823959d31507dee5c3ed714558071acc8f287e78e44b2831ebaa60
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10276 bytes
SHA-256: 7a6f739f85de58fc9a604d8bb45e6f6dc2fb84bd0148ebdc1717b18346cf4744

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