Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80a34ca4ef0b6d4…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 19:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 864bb1be62c6042b7f0990af0f6fe991 SHA-1: ee411de7e7f8613fc678cb110281a328ec3973d7 SHA-256: a80a34ca4ef0b6d471da7f15f14eea0197eae8e3ea5077a92341cd9305cdb4f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://execdentalclinic.com/uploads/ckfinder/userfiles/files/sotowiromaxumol.pdf In PDF document text
    • http://agiusfuneraldirectors.com/files/file/gutasusamubekiwoxusi.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/lifodobimuwazimijopolof.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900ac21f519---88148466819.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/78f06f1a8cfde5092886bf042325d112/25455805933.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727aa3afd3a---60929014904.pdfIn PDF document text
    • http://ridendo.cz/files/file/18074304339.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/66316267075.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a148c3de6ae---35777870929.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9a511d04b2e7af2c40140a4370913a7c/bekexotomixab.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86846c64e2---pilozivilabadavuz.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/29364191733.pdfIn PDF document text
    • https://iword.de/userfiles/file/pobezagevakiwasidoderu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/80002769805.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/29627994798.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089b08ed26d3---rixazewafusafevimo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/tupukigoranukoro.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/mofujafebadurutirawiketu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/d0a6d0079374cb1da11c8c0aa55127a4/65584786280.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/45292841673.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/50ef9014609c97d5a08cec2da7394342/50635015918.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d545cd4dee---51873121411.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5acc2c9e8c099120927aac7cd40321c3/57705556611.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94126247944.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157df00846---lujusamolimupetorafuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=due+meaning+in+tagalogPDF 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_off0000e778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE778 10284 bytes
SHA-256: 96fe393a97197159e59dd4ac92c1c10bbdbe37d9e2e00e29fe12c4592a8833b5
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 17720 bytes
SHA-256: 578dc1db2f5d2dd5c2550c251f6f38ad03169c49c3da2df2a72895130804a379