Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24ffdc2d7a6abbd…

MALICIOUS

PDF

83.8 KB Created: 2021-10-08 17:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 79609bb94b33ce8ac83b548f889f4eda SHA-1: c39b6ace36654408bc5a793a6bd4fc97176c0bee SHA-256: b24ffdc2d7a6abbd54dcedaf54aae6883693aa4cdd0ab12e45767cfec06c11a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=how+much+calories+in+100g+of+rice PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150d1f9ec350---95341803706.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/wegaramolutofisozodi.pdfIn PDF document text
    • http://chengzechem.com/upload/files/walesopexuranowenapaneber.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/76369872435.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6bbc9fb3e0069d8e6fa87b352a904c8b/jakadixerosulatimuvuvok.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/1898926371.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/defupadenekupawegixib.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2ccdba71f6f83f015633fe44f8c25fdf/36362027751.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/75281163126.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/sisaxapasenij.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/soxoduvudujidusalidagij.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/96170258223.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/raxirelemuwutasifukeso.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/06qkihp0o2216e5082cglbl6s5/nudiveto.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/volavakomuwopivivikifale.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/35269074539.pdfIn PDF document text
    • http://skupka54.ru/upload/m/pokiko.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/58282146686.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/64784689531.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/rokujabi.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/zisudi.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109211358214187.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kutakametetimoja.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 11036 bytes
SHA-256: 83c8068843f9996988eacdcf983932d58d2122a2e979827a3a016658cf75d5c3
font_01_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 18044 bytes
SHA-256: 716e05cf0321c26f0bc1afce8eb3b0d2b0409efbba723ced81420503d88180a1
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.