Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e250b5c8f1468a6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 23:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb4f7f85c8cd3eb37ba17ffe8be66e4d SHA-1: 28836df0dbca43d540c9d76b91e1841e787c1b1d SHA-256: 9e250b5c8f1468a67ca5af49c6f7b7d440e90424727e44ec1957b259f983ee99
176 Risk Score

Malware Insights

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

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 that point to various websites, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather for programmatic interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=3d+photo+trend+android PDF link annotation
    • http://studiorestagno.eu/userfiles/files/repenijeziramafopure.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/16584195323.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/78983682444.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/rodimebogukerajenozem.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613251658e574---peruselivitipenonewo.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/44311370347.pdfIn PDF document text
    • https://jobtiara.com/files/files/76772559430.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/92627932408.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mejukanuxuzezirivu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4c53db36---bevomew.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e666e46585f86181f496cc0ab137e6dd/larupibusowopokip.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/womesasawafojelexosisuju.pdfIn PDF document text
    • http://roocenter.ru/upload/file/50659073737.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/49598678780.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/rugedinavibe.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jenebikamopufipax.pdfIn PDF document text
    • http://huntland.hu/upload/file/kulimug.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gevajagujiba.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10b76f4a2---35917499455.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/metotitizagesaxidakap.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/69283951769.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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 18040 bytes
SHA-256: a82c1cf2a23fd55e0ca86db91d19dc8eb22252146ddb8aaa727ce3710b2051ae
font_02_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 10348 bytes
SHA-256: 05716d782d852f92759d393087cc11fdb239642e33fcb760dee01f3a5fbf06b4

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