Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b65d5ee4e99f93…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 11:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64d81645aaef37d05bcef362265bb357 SHA-1: 0b7747e8e917587670b93caad22019b623b78ba3 SHA-256: e7b65d5ee4e99f9371189309edb44260a5660d5891f6e06b978453f184be4d89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. Additionally, an embedded JavaScript stream was detected, suggesting potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/sedul.pdf In PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210702071510.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/sedufitapokonobetifevipo.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/19687068222.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/71085581417.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/nizewufebina.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9ea06e8117e286914a516e23a21c0435/wojadoxasexowobewobixu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d10814433---92094746756.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/xapiniwetilaniz.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/mufosugi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7742ce6abc---87713508225.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/18893674030.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acad2032dde---gifuvesajezuremerogixunu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/tunilapukutenos.pdfIn PDF document text
    • https://aaaxxion.info/images/file/63148033404.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///laxebozuludomowimiliwovev.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dokesezuwejiko.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e48f28ceb7e---felajonizorofukir.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/22727288871.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4e990a0db---zexut.pdfIn PDF document text
    • http://usmleworkout.com/files/file/48671202305.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/kogefemipisonawazavoxuji.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/fiveromoxavojedi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/76958960411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=aquaero+5+lt+manualPDF 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_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 10372 bytes
SHA-256: 4b42efeb7e113fdce35c047174db30e4f1729b3f890eacf48f0455a163bff8b9
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 20204 bytes
SHA-256: 6ef49ef2078b227118eb787c921a63184b7ff7dd717ee6f7d9c3ccf55056c834

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