Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb14ba4d039ee38…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 02:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99f72600c209ad96fd1856188b004b21 SHA-1: 913d0467902a93647f9e3fbd64a732007a091ac1 SHA-256: 1cb14ba4d039ee38113da1e28caba329e655c0ddd3a0daaa31f3413d0ebbd6ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://megashina24.ru/files/files/doguronopepilifemozarib.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d11844714---mogodefitisuwepolazo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f55ebe049d---28385841754.pdfIn PDF document text
    • https://edusfera.pl/upload/file/rarusaxixajusoli.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vimomedukuxanagoboba.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/mozakekigepajubomubasajiv.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/38738594317.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ddca83ca1---29150357674.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d44f8f25cb1---31798774878.pdfIn PDF document text
    • https://windsbs.biz/files/file/mugoteworixijolegiwiped.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/xiteg.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/62215e29d3164eb0d883ded12b5fbe2b/81060378692.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/371720502e602d68856a58fed3a66a82/govudifojuwalapod.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/63295138500.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/xikebunovo.pdfIn PDF document text
    • http://boki.hu/editor_up/wobubopigitigizixosa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dacd2ee8671---kodaxikugizum.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/44f05bfe189a8e6f9d1cb8a5a525bbb2/49714128274.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/sewutekasigekonepew.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/rewubivuxunilafikoba.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/752a4c8d35562ccdee837aaf8d25a46d/gavujevunidopudexiveku.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5dc3707ca6cfe101eb82b7af31e1d0d0/lelulofilerudidesunumul.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160853b38a3056---xaguvumubufasodepagumemaw.pdfIn PDF document text
    • http://thomas-reunion.com/clients/8/86/86f5f051d314e00f57792b8428d7085d/File/gerofujufatadusapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+current+picPDF 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_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 17288 bytes
SHA-256: 7ab17903ff0467e32d014084d6881b08ebad12483caae0843efc7d1854dc24e5
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 10360 bytes
SHA-256: 209d01590eaf850de73aebdff958f515423482d56c01e4fdf88e12aad5e2018b

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