Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8baf97ad8554fd…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f244c558f04e5f51d9a0708e5109ce36 SHA-1: 14393447bd000e39595e5aa21a7a5ff6d6b3c65c SHA-256: 2a8baf97ad8554fd149d61633b0fd7f48e75f7937ae46abe5f580267b1b45ebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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://asckhn.com/acskhn/userfiles/file/61806321590.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b811e93fdd1---nobigipesive.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f6442e4ec4f48969182594bd3002f874/bugezasezibajigir.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b165adb129f---nexuzeron.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/55751224375.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/53679353009.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6njds36r18jjc7fcu8799mkns3/60058632704.pdfIn PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/69301884128.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/52202149578.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/tobuxabarukoserajesitok.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a406445d978---kunorejejilidiralun.pdfIn PDF document text
    • http://dogable.de/userfiles/file/24475200766.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de72d018e9d---35169168541.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/41990666701.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/todefabeliv.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/55778636114.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/57673810717.pdfIn PDF document text
    • https://khanikango.in/file/68630451707.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/tifimetewuwipidikufep.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/28422562839.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0bf9f3fd---guvif.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/20263256191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=basic+german+vocabulary+book+pdfPDF 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 17752 bytes
SHA-256: 8e4f0f30dbfc28b2f3cbedf3487f65b0a558c9e7e1d35688dc54b7bd4a248b44
font_02_sfnt_off0001319e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319E 11432 bytes
SHA-256: 95b019a3cdedc4d7206072b545343e3fe6e70414e62e1e899f2531f4b3defb78

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