Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efd79aa315c3a3a…

MALICIOUS

PDF

88.4 KB Created: 2021-07-30 07:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fedd19abab1287d7b98ffc6c7e5054d SHA-1: ec8bdd972d99fa65f4f4e4b363ba8ed4c4cc1c4f SHA-256: 3efd79aa315c3a3a4ad21bfd08fa53ee84b50edd1cb9146006567cf7b1f8f05c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a93145c088815e5e8784867d344e16c/xonukedulelebo.pdf In PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/posutivitatif.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/72148612364.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelegomadugonavesowa.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/66839480675.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085173dedf22---50823630734.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/figixirafete.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/81b3bd0282db092900136bfab4293531/lijifebasukosubezelovaja.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/71334b1d1ffc91e8180a59269f9f2d35/mafituzokag.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/17105259863.pdfIn PDF document text
    • https://avflash.nl/upload/files/30037586977.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/61312660269.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb7969d5d---daxabeles.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/7645182784.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dutebelurosawap.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/64512691590.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/43745176075.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4002796d4---53049466437.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zelanaworokiruker.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/67401834226.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a35d2d906afea4ad310ac14539dd8500/noxemo.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/2b499ee719e575b2c9898e5a0e640ad6/toginiwitoruluxuriw.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55da4ceab5---25447656813.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kilamotekopewemazo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d869f2cf0ed---54663542512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=texto+expositivo+ejemplo+de+animales+cortosPDF 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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 18208 bytes
SHA-256: 30067dd5635f23b59df6b7c7185b84fa2aa622b08f93bae582654a33126438f8
font_02_sfnt_off000137d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 10936 bytes
SHA-256: 29d8018cd8b4297ffaa54b6303f13e6e8b4f61cf015d9e4c731c5045dec9acb7

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