Malicious PDF — malware analysis report

Static analysis result for SHA-256 2298ba9cdf26b4df…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 13:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f43b7a01d39fe7a561e4020daf4a667 SHA-1: 0d2fc344bceff332748446e0494bb4496a4ff0a8 SHA-256: 2298ba9cdf26b4dfa22a293a51aa47c993720283bab3c1fe33e56bed0996eab4
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content through a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mercuresamuichaweng.com/admin/file/37047029469.pdf In PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/57f2dffe626e028c690f2e9ec153a745/93386665633.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/49748605121.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/34927405288.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/wuwowaluvurawenepala.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/53009640167.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/teromutorawizex.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16070c404cff73---wanekepiboderak.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/budezodo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xusomovekupez.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/76466699754.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/24721215930.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/25343610712.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/2f4ca304dbefcd7516f57c8117feb5a1/26682128835.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/jawesipu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/59053769430.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2ee81810e---furabig.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2a8579c---24193990413.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/29965082878.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9520f09a0b---16613820789.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95a28c061c3a59d06083c6b08612ec7f/85014439036.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/48429694492.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a9d54b9f5---50965494099.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e3ecdb56b---38288756614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=glass+ceiling+in+hrm+pdfPDF 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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC28 10888 bytes
SHA-256: ee83037aa313186dbb7f1ec02b81ca68a0056c7a59ab38ed0c339be448e4edad
font_02_sfnt_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 15096 bytes
SHA-256: 9289dcae521a6a7fdee2a6746ae5e69ecee2cb6f52fa7ad6288019611c25cc30