Malicious PDF — malware analysis report

Static analysis result for SHA-256 79481ec1d927e534…

MALICIOUS

PDF

71.6 KB Created: 2021-09-01 02:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c551198437a63ffe978905fd2fc288d SHA-1: 8845c691badb030c107411e91fa42c1c7b6a27ad SHA-256: 79481ec1d927e5343601087e6bd811fb1116798a72618f08868e2ccb44aabf4f
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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://photou.cc//ckfinder/userfiles/files/96400840020.pdf In PDF document text
    • http://citygclub.com/ckupload/files/33545609232.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078d35e8dc3f---62697391652.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sao4ga6rkl5ku93pd9dqgr3pv1/bigurikisadokotir.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/lebunijuwaxusoso.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072b136844a1---jovosumet.pdfIn PDF document text
    • http://pasaru.com/upload/files/vifez.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86c01c960---fojepafajitokiraso.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902de69bd72---kibowejizimuwososi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210428125420172.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/jotojatazuraseritasovis.pdfIn PDF document text
    • http://insei.eu/userfiles/files/23284800779.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/riminow.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/48b8ed477a4abb49922cdaabc0e7b50e/nepolegedewogaxima.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb3490a41---68155680933.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/gelinuwigomofugedix.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/gaxuxasulejebag.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/renijaxapagobabimulomeso.pdfIn macro / runtime command snippet
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/pizinuza.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/jekazibipata.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hve3vlh0opgr51g5ogf519tp16/botexivikeve.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/golufarig.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607813a934a15---7488838796.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vovafaragisizegeludarela.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2cb1203f---robepazedawezumalebixite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=enhance+other+wordsPDF 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_off0000b8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CC 15820 bytes
SHA-256: 7bf75ab2efc18adc0830518add8dc3b9dc67430d35e16c1bc2c91ff276c339bc
font_01_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10400 bytes
SHA-256: e913a0866a509d79ae50b5f0b5107d3df42d5060607efd88656dd82bf74dae84
font_02_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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