Malicious PDF — malware analysis report

Static analysis result for SHA-256 69f421cf2044f8e1…

MALICIOUS

PDF

95.0 KB Created: 2021-07-19 23:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0aaa4c80d9b925e00c9232ca5100dd25 SHA-1: b72587f670bb4f3026e30d7ad635760cbfea225a SHA-256: 69f421cf2044f8e19004bad764bea2366b4e8c1dcd4474e53f35e09e2f003682
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://bularz-auto.pl/images/userfiles/file/xovasinexunipiwor.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da47b3222---tuzalefivizapu.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/lufobidijarapakovudu.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/xiwububerofevopadidal.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/kokn59ga8855ljs8e5u965r991/gegodedot.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f496723ae6---26836197527.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/40574007113.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/36360256748.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qgfrpfq4car1h9qu56lkkbvn8i/momigutov.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/zogimezopezedovigobojemu.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/7qvvbslndmd64evmh3hl71nj2j/96877548173.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/zixexuturer.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/59627871403.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/na8jpeida66n8g09s18i3qasv4/risuvifazaz.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/0audnustfiaemaqur4n1lq3s9b/xirovovaweteniviza.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6a95b07eeb52eaa2dbff967b05b1ecdc/15646979409.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/535816837.pdfIn PDF document text
    • https://mollis.rs//files/16346931343.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d56d592f70672faa0145b259390b6031/86122916292.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/15133478311.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f7c58a57---53545190255.pdfIn PDF document text
    • https://vleek.com/uploads/files/jizawadinovediniwojobofol.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1vbpnnkdtf92k5ntcttndl9ae1/27325300559.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/zikekexekuzixed.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/ludasezidotiwez.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/8e90129b2707f79f3451044ae2ec7638/36375346489.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/zagegetujisabepunesesimiv.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/49656939821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=access+test+answersPDF 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_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 10032 bytes
SHA-256: 8a21316752fc408962f9f63868dc94598ad073ba9edc459156058d8daf73abd2
font_01_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 17100 bytes
SHA-256: 9683768bc57359ac46a37bdafe2003b8ee79f289e49d96e285ee4ae9b4c230b6

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