Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af804c67d309c57…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 01:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19eecfd46b898f398aa814270eb11a8a SHA-1: 29787d34cc85db6f09c8a50f7b7d5f9fcce5d210 SHA-256: 2af804c67d309c57cf3d922537f23c366c08fbe3dd0208ebacd9827fe8ffffa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clear-es.net/yamituki-n/uploads/files/50457540246.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/30523196720.pdfIn PDF document text
    • http://uhorder.com/upload/files/nufejolujozojodat.pdfIn PDF document text
    • http://dsraxys.com/uploads/vexipirezimaverome.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac99e0fb35---mimilatilo.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wevigazapiwuravuzave.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/lenizebebalojut.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wetopogoxomemijek.pdfIn PDF document text
    • https://bawauang.com/contents/files/renosovujidaju.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/12033293107.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/modinudefawivuvo.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/xofewijowef.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rokesiperanuxefan.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/newomitumo.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/19533290579.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a740b90a9062da2bf6ae743184e09c11/60923299535.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe8c771e3---21471046210.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/22077839352.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/vedosowajudufuvadenud.pdfIn PDF document text
    • http://c-amc.com/upload/files/7518412712.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/mixusipowenigozos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa63752c3---komozotivan.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunumab.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/detuvapamatogiwudajagab.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nugitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+perfect+pianoPDF 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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10436 bytes
SHA-256: b494eb5f8d25fef9e3e786a5f88084b04423c8db17956eaf442475c750cf4441
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 17484 bytes
SHA-256: f389d5b37baeabaf27d5e3e1d87ed63912f2289b25ec1e2d8876f543c29e3dc5
font_02_sfnt_off00011e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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