Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6fb05a6e21afb9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 23:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41d7e4b0a1833f13153235142e0972e9 SHA-1: e4b8672492bde70c64e1d204543e2389aea8e7cd SHA-256: fb6fb05a6e21afb93a5d344051cbbb514055216d1fdf4b5668f068b6ccaa8376
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c436b7b60bf419a2c1adc0bab628031e/tapovaz.pdf In PDF document text
    • http://kezmosas.hu/files/file/waluges.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/vetexonevan.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25791fd80---burudupow.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/75733373446.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/88298840079.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/vevegexejil.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/2ef0c397a0e5732d668de1cfcbd179e5/kagew.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zifedosogajavabigafu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/rejudima.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1023509185.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/wizizusoxotudoba.pdfIn PDF document text
    • http://artdental.hu/editor_up/pasazoxobemaxinigudolis.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93a615668---1624798218.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/zovuvakosufebo.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/92174477057.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912035216.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jigigavinilepefetikagu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902040245.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/92618341213.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210917_4051D31DB217C008.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/b9822a9cb6e0efeb3990e92b140d45d2/xugekomabididofototimil.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/68302215854.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/67336328464.pdfIn PDF document text
    • https://alev.az/userfiles/file/zobivizupafupuwitutisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=automatic+call+recording+proPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/70297258117.pdfIn PDF document text
    • 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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10768 bytes
SHA-256: 609d72702c020f1fdcce3372386fc671e7d40dc9854c8f4a76988241dd8b7b25
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 18448 bytes
SHA-256: 59d21d8abf74117cf8e04cf76a0cebbf99c32aa05a3b578776a969a20b13b5e2
font_02_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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