Malicious PDF — malware analysis report

Static analysis result for SHA-256 45151d28e4e1b263…

MALICIOUS

PDF

136.9 KB Created: 2021-07-18 21:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 81bd2516818b071dd844c33339d9e3bb SHA-1: fd910b595ec04175d5f55a7bd65913bf11ae5645 SHA-256: 45151d28e4e1b263d3dd9779fae1eb920881324b0d6fdb9620a600e2112f7174
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://younewstoday.com/task/userimages/file/xojivofakosa.pdf In PDF document text
    • http://derma-dts.de/files/file/tasodinemafapibix.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/39420652488.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gg4c07tv5naifr5oqdoc2r1p61/jajekasagebanazofonilakat.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c77d66d48d2ddc331d2923583634443b/744042113.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1654d315e0---setotukujaw.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2503161a2---lebufumurot.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/841d2a68fa4a58790e84a96f75878a07/14630832368.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/46b1a25e187ee8ac18ba9c2ff8f5be56/juvukinegopa.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d9f4c761ffe87392d0ba7f755577f15/72158830606.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fovurorekifuka.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7f7f2897---17698387670.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/wuzafatakofe.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/rarovififexoribugugawudad.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfe2386366---sudalizisozalo.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/bowipebipolil.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/jetadipi.pdfIn PDF document text
    • https://actorconseil.com/files/file/28904188577.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/097b0c0d234f5bb6c5afc2368dc4fb10/89327019460.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b655e6855---39639678960.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/11634190868.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/lotek.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/da2b00ad0a7ea0886d651e53ce1365b4/54336007217.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608581abb9c1b---pekizuvazizatupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gender+and+spiritualityPDF 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_off0001b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4A3 18916 bytes
SHA-256: 111d6bb5308c6afaa97e291eea20f08afdc8d5de6651b16d44921e65eb23cf71
font_01_sfnt_off0001e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE1E 10516 bytes
SHA-256: 0924fdaeb0c3aa44c71ea596365e8685234f63188ef31cbf4f823e0816784016

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