Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a470425362cf2bf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 02:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d76d56d85c091796e009b08773c78cc1 SHA-1: 09da3e669c54b65ba79a237830b0d2e527459607 SHA-256: 0a470425362cf2bf51e113881322c9025489351820fb1256c43d99e96fbc56e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

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://queure.ru/uplcv?utm_term=ser+bachiller+junio+2018+pdf PDF link annotation
    • http://daisin1977.com/js/upload/files/texogovabonifikuwuxozibub.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/xunupev.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gi0jorlrojotped750l0v7qpn0/dositusimiwufiwato.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/32830701108.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/34319323773.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/ferofadavifirukasan.pdfIn PDF document text
    • http://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/guzidonoreja.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/97914131836.pdfIn PDF document text
    • http://soc-in.com/data/media/files/xewujozo.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210712_8CB3CA52FD981997.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/lamip.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1af651a7---356733862.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/edd1316e8ff49eee3df5fb3ffb18a735/puxoragorobinunobunixi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vidowefupiwu.pdfIn PDF document text
    • http://rafaelokazakov.com/file/33388093998.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/564d6b0cbe591e486978bc4f8dd9307b/kodawekonubaxofukuxuxat.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/gevifakonatomunosasorafow.pdfIn PDF document text
    • http://simonide.org/userfiles/file/664463363.pdfIn PDF document text
    • https://cityface.cz/res/file/nijetusavarufoxunumabe.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/616bb5be01abf251e7c062d17cfa9d1e/ronexageki.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb9f4f6ba---vigowazaxotej.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30551600038.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c759cebef9---32224129462.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 19032 bytes
SHA-256: 671e44803d7238cd993e7bfeec18f27e1e1a4ef85c78d7afcde45edc504cd1de
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 11400 bytes
SHA-256: f7d6cf3cf9bdefe79d9e0181c273e362b5383a3108c81f743a70f00f5809fa23
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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