Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba26bba2e08cce10…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 16:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1e02709462608511197bead96a501b2 SHA-1: 492a20ba12b0a6475e5e7319a2a2e2acb234826d SHA-256: ba26bba2e08cce100f0a1a1231eb13e2d721390dd8cb41566958e97d532ad05f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malware. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=roblox+fly+mod PDF link annotation
    • https://bhavanarayanaswamy.org/userfiles/file/11320928683.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dmelt2rgq8d5ialjpdmhq92ju1/nozopinedifexerifig.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/35529872645.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f561e7629a94dc85e8545caa0295194f/zedeteginosoje.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/6206402236.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/betulaj.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/84824272532.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613583f599f87---timizeke.pdfIn PDF document text
    • https://ksboutlet.com/file/files/35951081811.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/22058898851.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lasuluvukovajomowoto.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/34755498215.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/nezezirawikuvobufakoxuxu.pdfIn PDF document text
    • http://geodez.com/pliki/file/nesoragupij.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/gidewozurunufotid.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/72968893342.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/53077385718.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/bulep.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tapoxuzaxopixusodu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/9f78b639e2b9306fea1148e370d1dd79/83206264926.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/fb464b0314a23a560e21d2e814ea6e46/88077493177.pdfIn PDF document text
    • http://hexindechem.com/upload/files/91401706845.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mafofema.pdfIn PDF document text
    • https://tmtteks.com/files/30329062378.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/bavanufegus.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_off0000bf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF48 17240 bytes
SHA-256: 95f086375f99f3adfccc19af61b3240a9c05de1cfaca4ce75b31c642623bc2a1
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10060 bytes
SHA-256: 3c1ecb8a7f6d6c9368fbbec92a3309659b1bdb16b47307883f1a68a415eb605b

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