Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dc7163ed9c28f2…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 02:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5c9a655cdd4df0b8642c3440458b008 SHA-1: 9b6c9dedf2cfc79180862667f6d4a21c517a2d1a SHA-256: b0dc7163ed9c28f2762100478e0aeae1ec56753733b8462a0679e78041e6f707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to these external links, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://pincailight.com/zk/UploadFile/file/2021062020064073499.pdf In PDF document text
    • http://aeronautike.com/userfiles/file/30211696365.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bbae4c80a037cb270615a5ed23f2286b/tativeledivafuzuzulegil.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b483acc841ed57742760dc6864e1ea4d/62306006573.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/64197331430.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/28573228f5c934c65515a637c6206f24/katimalo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b278afcddb917b2c3430d7dbe2a45619/72490237619.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/vewiwikuxozene.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/4713265914.pdfIn PDF document text
    • http://onboardviaggi.it/themes/userfiles//files/80089597969.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uq6v5tg52nob1vg4genin3ntk1/67139587505.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/65423613647.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/19540369569.pdfIn PDF document text
    • http://brukbet.com/user_images/file/vubawejaxik.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/63fc54d1fcb2213f6b232156d5abfa38/vizapimujukus.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/81477161447.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/ferogafuxikewejajo.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1aeb69cc---5475247628.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbba7503bec---77386746228.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gvd0b2ir0btit83rg3fkipg6t7/parejoxorurataxexuwijiv.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eekl7tbgrfs1puno8b8ap4hdv7/lamobiberajatedoxifunu.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/16953061222.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7b9104577198f267b309ab4ebe2ac1f0/28679981844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=iq+test+samples+with+answersPDF 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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 17348 bytes
SHA-256: 1178f249d7a71d96583c807f7ae72597d6945e61e0850cc02ab4900f0c2761a6
font_01_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 10580 bytes
SHA-256: cf1ba643f5a745bd75662b7526c1d1f7479fdba1cb3a9e5c6d861901ab597c28

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