Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df4efc12df50467…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 16:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51bae22448e7cc18a9f804d87094df88 SHA-1: 61ab1704b64555c9a7c85189424554752394b426 SHA-256: 4df4efc12df504679aded8b0faa85f2e8068aa686b51bd8a2560972a4da08b47
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS uploads and disposable domains. The embedded URLs, such as https://coretry.ru/uplcv?utm_term=mesin+basuh+manual+tidak+berpusing, likely serve as lures to phishing or malware distribution sites. The document's structure and numerous external links suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=mesin+basuh+manual+tidak+berpusing PDF link annotation
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jajuj.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160790b405a057---dopigegabobenusujelef.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/jubozar.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/pugopokiwuvemobe.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/14153996278.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd06a5a17ccab94a4e394c3388472ae3/66019743868.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/46746591349.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/rogutefuperijemuvogejos.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/witogila.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/65445095747.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/01070cea142042d299b325079b8c9a3c/86608283267.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe8d222c4d---26681797006.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/pevinutidamomopofegak.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/17173938239.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/bitupobopukopodexefutolo.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/60866654350.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/31002431723.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/dixorixutovakikibusebel.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/18686378046.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/34601270921.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/vizesejeked.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/75305386169.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/xefovit.pdfIn PDF document text
    • 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_off0000daf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF6 11044 bytes
SHA-256: d5d287f219a4735a882cee555a4d7880421c585774166837f17bafc423704f6c
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17260 bytes
SHA-256: 9f8417fbd74a66d9ba853974497cb5f16e72d9af1d429aad1dd59c457ac56498
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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