Malicious PDF — malware analysis report

Static analysis result for SHA-256 333c51cb134e1863…

MALICIOUS

PDF

87.7 KB Created: 2021-07-22 06:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cfdd1c342875a45a40d8c69cfc6bf3cd SHA-1: 047bda8862d4b16d1667afd8f24efb4def1bb8b9 SHA-256: 333c51cb134e186361e7bedebc20c8e99ccfedd1568fa25a7c95018dd6443335
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links pointing to potentially compromised WordPress sites and other domains suggests a link farm designed to redirect users to malicious content or downloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pilisilovaskert.hu/ckfinder/userfiles/files/lawonorexi.pdf In PDF document text
    • https://zzwgjx.com/d/files/sofevopasunajoxuroj.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/tadarilojufagakejanojugi.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/18498429624.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/7f63bb08ae0b78c6a9efcf6476bee978/49013724831.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/49016637611.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d74fdd478a5---fitewo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fde8cb7b---returavotizogusuf.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c867ee60590---vanifareseniwobijiruz.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b93abf2ac05cdaa1245c5fb23ec8ae95/20976691478.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/nefunupexivum.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb605d085c0---18804896226.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bepitazunudatiluva.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad67be06f---dogufu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/o26v49en7qkei4v12ppo13ba0l/88148772328.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/joxuno.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3c45158ea2c4ad26cf176778ef9a027/24617422381.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8665e24aa1576dc06f5fd4ccc669f9ee/24184095781.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511234313771.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/88246845787.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p505ncpcrql8dvphs2hac6pii7/85685650762.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/49894499588.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5c3f39527c9d2eaf66734bbd2b2e7f8e/ronadari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=printable+5+point+starPDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 17812 bytes
SHA-256: 6ad3a8710d7ddabfc7f20357eb6b1e2fe6e23cbce1a4b59dc6b982049b15acde
font_02_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 10520 bytes
SHA-256: 1dbd8c5ea3fd19b9f2217bde39e448935171a4820e00792af42613645aec04d2

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