Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d58c5aa65db91e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 03:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 14fdf06f63e0927ba56738a361409ad9 SHA-1: fab42c58c4cec713437e8903a9fbd9496e9e0101 SHA-256: 23d58c5aa65db91e80ae567a19a08ed5beae24458a53978d3ff1e6482f1c60bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=how+to+hack+android+phone+for+free+apps PDF link annotation
    • http://avandcie-energy.fr/ckfinder/userfiles/files/46915040972.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d08978642---87923349656.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/49506959087.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/zutofav.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/nimozakelefibubozopumiwu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613860a9f17d3---21256580688.pdfIn PDF document text
    • https://timminsrenovations.ca/file/IVIgUiW876b1hUIQ.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfdc0dad2---31069565306.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/gupimoxipesewezida.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/fadumowelavu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/36948438859.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/jozamifufawaj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a65bfa61---79562576101.pdfIn PDF document text
    • http://landpas.pl/upload/file/jokibolutimobopi.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zevelizemazowedurowili.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/74208455903.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/faxodepovego.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/kawejurilapujatewazeri.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/32983540904.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/firajiginijinilejuzako.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5uf2sh0t23ravdobou6u5nent5/gekepikatu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/kinemotadaguvekisusifeji.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/55053606997.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/watuzopilijugapoxebuni.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/89519377485.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_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 17564 bytes
SHA-256: f42109124ae72f69ac1152be25490d96997f3e624050ba7a31545ca79daf50fb
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 10840 bytes
SHA-256: c233c5546ff611f5a9004714c894d38f932fb64463a02206068d429e77801cea
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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