Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95c55c03ce0ed22…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 03:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6770512f5cbe9182ca66e78a07ae39a3 SHA-1: 820280781b11e5c0d7cbee0802d2c09c3cb6ee9a SHA-256: e95c55c03ce0ed22ba8d607768a06fa8022ed0960c346db0f3e7e2d5e78effb7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML flagging further supports its malicious nature. The document body is heavily obfuscated and unreadable, but the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://profstil.az/userfiles/file/baberowebegagaxubuje.pdf In PDF document text
    • http://tuivaivietnam.com/uploads/files/fijotogezuvifajegibanon.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/25149230216.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/80174112995.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/wuduwaxinivudekoto.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rgd1dvf81se3dj2h3kr62a7bt6/resimar.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/dagirotiva.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/10307185154.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/dakerubijanezike.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4051cb8c---vikipof.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37044972100.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161447011709a2---40794069987.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/8366476895.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/71567692471.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/babunukafilurovez.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/janoluwizapesami.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bewezigupiditamuxixukewez.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/93111992494.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/8201835038.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/xuzozirimu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/sixuzerowiragijubefiramab.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/36623742441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=liquid+teardown+apkPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10552 bytes
SHA-256: c46068a5549db23dc1595d47719a66402897c3690729fa534a6741c7a4b78582
font_02_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 18016 bytes
SHA-256: 967dbeaf6fb11ec97ae8c81e1f10e66d654555309b8bd38f62402567d451e5d4

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