Malicious PDF — malware analysis report

Static analysis result for SHA-256 87136654eac9ac5f…

MALICIOUS

PDF

114.4 KB Created: 2021-08-12 11:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c2276971f92e700a6a4b9e89abf67d9 SHA-1: beb62914aecf62c812bdc2e6a58369ff565879be SHA-256: 87136654eac9ac5ffb267319d0c8691e39b306cf965a4f660e6e411649a36a2b
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were explicitly extracted, the presence of multiple URLs hosted on compromised CMS upload directories suggests a link farm designed to redirect users to malicious sites, likely for further exploitation or payload delivery.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/d98g5s2tc27olkro4lqe114s84/zikitog.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/3492037bd3b5cf89451196df031c3b3d/95539158187.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/dab3cb50476d001e11c8b22f38accfd5/98472380985.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a119f38e0ae---95914929979.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/junatakadoterowerifojupi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e6d8b7dd5---pikuxamuvonezenolir.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e177d9bb---bonaxago.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/dobojupave.pdfIn PDF document text
    • http://alixdemassy.fr/userfiles/file/fiwefizapusujigetawax.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab487ec7113---videxufeputubugovikip.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/20021915278.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f8521e7b2---jotesimixegi.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/lagodomomesuno.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb48c2093---16032121377.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39b56392e---pabivagud.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/b5dc2e2956650c3553eabc24c637222e/wofabewagezijubakod.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d6145eb6877959fceabfa6db28f534a2/13972427272.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077cede8cb9d---17187132263.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/monujixewidulezesot.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4c266bfe---39915798935.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/balekuzapatisi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1db9f2855---83038898346.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c62479e2---wugavego.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610e50943cc2a---75897711095.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/2780511539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+put+minecraft+on+chromebookPDF 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_off00015d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17553 10940 bytes
SHA-256: fac531b9ae4aefeaf78e3698803d95a3d5cba06059285736645529f976bf4bb5
font_02_sfnt_off00018e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E42 17452 bytes
SHA-256: b12615e7d9dbf125c802ab738b03ed33be01fb6be3b3d7a85498e57ff86579fe

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