Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3b1a74f75255e3…

MALICIOUS

PDF

85.2 KB Created: 2021-07-29 13:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59a7aa0cb6678109c12cfb1bc68d0ab1 SHA-1: 9506ba82c11f2e0551ce29faf6620f721e5e50ce SHA-256: 1a3b1a74f75255e36ccc00454298a05530ec979e7d2ee32043b48209f6cd3ea2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/990fbc81f2854f5f1023a39fceffceda/98872794929.pdf In PDF document text
    • https://tasleemdubai.com/userfiles/files/90544519763.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ogp9dutfg316ffpjoejj9kisns/76810132696.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/b8apq7nti3uu2n4oj9iqipohm0/5779100239.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c090576dee---pusoguwaretodagopane.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7252864540185efebc43360f278bf53d/35839368518.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e84750f7---53681189134.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/zugesulewegoribo.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/at18o1343iiasgjqnu2i5vsc9s/85473977403.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/nowaji.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210531102734.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc63c8b9ab8---sorodaxinasuzulawimewak.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gekizuvomunudavetapinimep.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c181a950194---sukakirogebod.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/lasozoxugabobumodilak.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f013ff5f0de---73451294971.pdfIn PDF document text
    • http://z500.si/files/82654325520.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/338f5df6f3160802ee3ede696c8223db/fegexosanoparobopiwekudux.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/400527cf9393d99d31460d2af79ea16f/raroximodafubamop.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/1fm3q7c6i5qipaass2s8o2jgos/79562783103.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/wumubagisev.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/46050591211.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vg8cq56qcjjcqgtr9a8pfbm094/giwudegoxadanab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kaggle+titanic+dataset+solutionPDF 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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 17676 bytes
SHA-256: 691f182ced306fa6e0831d77d4d8d7255459d47e6646a06b8ab6dfc5aa667c7c
font_02_sfnt_off00012f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0D 10536 bytes
SHA-256: 51d70ae1953067bc5b33c90ff81f456da82ca0103f69d772cc1722f7ccd222e3

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