Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8134eaf23e2f85…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 20:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 263a9be15b98c7478eebb9968ab9ab10 SHA-1: 6523ea09e9c9f75302b395023ab368fb56ba803a SHA-256: aa8134eaf23e2f856706f2ddae4463ccdbbb525cb30624b16cf3edea99de6bd3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hrudolf.com/userfiles/wileleze.pdf In PDF document text
    • https://bakwanudang.com/contents//files/95355768909.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/tilefabaw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/38d196c930a89dcac05bf2c381ef2bc8/duwalelage.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/52924681727.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e0645dc80---zofutorugizebukaga.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161109808a40cd---83158134342.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b821bee6---75897431604.pdfIn PDF document text
    • http://donghotam.com/luutru/files/74846168121.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/sodamenapumeguxekaxigili.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/48511839633.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9d4p193kgubrns502j9cevisvv/1065670046.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lezusunuxubuvinukodes.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/39d302a368c1c51352d4b1a24d01edfa/85740617677.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126ac4f65f46---ropopodekiwuferobegisida.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/korexow.pdfIn PDF document text
    • http://jameshamiltondds.com/clients/6/6c/6cc67b5d90347a591bf4e9c0b97a5143/File/82212982108.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/73716049625.pdfIn PDF document text
    • https://premiersuli.hu/files/files/noloxem.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6880388a5c5f64e77a73f4d5d1f48164/jexijanukajoba.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/dizakanepujuramosadanol.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4d2be5fbda8778001132250ca62f611c/57092373956.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/58551781402.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/163254ba3c56b13f0fc088b9e947fa54/57068709720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+adjective+worksheet+for+first+gradePDF 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_off0000c24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24E 16596 bytes
SHA-256: 0d3693f7850fe3eb3af8749430c57a7a98de568b4007b18792d8f163a4aa042e
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10956 bytes
SHA-256: 9f80ed10641d99865b2fea9cfd5141669f88eab6fce5bfb9d7ed5b8ec161f147

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