Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5a78d9128eb6da…

MALICIOUS

PDF

99.2 KB Created: 2021-09-13 07:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dd028d17f242a24a0eb6f006bd728a60 SHA-1: 788963d4991fb6fe94afb729c48d73696e23bcbe SHA-256: bd5a78d9128eb6da8ead54e78396083aaaf360d938a9f31422469ff188da6454
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tofuyatogo.com/uploads/files/82322754834.pdf In PDF document text
    • http://sintellect.ru/Repository/file/sadav.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf57b01dd4---gunuludovekemidajemukivan.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/juvabifibiruw.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d457b3cb41cab54e525d935277fcbae1/dalajegiwuwabuboxutoxa.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/xuxaxebuvi.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/viveretobinig.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/16909714553.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/pumavadama.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sunitukowipikuxab.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/ralukarosiwase.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gufiwa.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/40055757806.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161354a6b2f040---gikuzelizejawasa.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/44039089803.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/suvivabukunekawozukepefa.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/26103369461.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mepizezas.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/zutor.pdfIn PDF document text
    • http://savemaxint.com/files/file/20001301811.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/kepepageximin.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/sanexivedekeponav.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/91508006055.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d6c9f0eb54dd56a69ee4ec6855084653/83877803090.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kojasubeveziwupinepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=student+feedback+questions+for+teachersPDF 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_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CA 18088 bytes
SHA-256: 39b038c8dc20e56967d82ab4e4f25c7a8f8265ebae04312093994ff1a60267b7
font_02_sfnt_off0001650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650E 11080 bytes
SHA-256: d8d32b9a7468a03ebf7237d81d389f1cee0d0a0cc75085bd4d82b73e43c6ce11

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