Malicious PDF — malware analysis report

Static analysis result for SHA-256 471fbeb56e3f249e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 05:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34d6f014e95b3db0b70038c6e8887ca9 SHA-1: 2a0a79d143ba1a30b88bf1a907b635ce3c0eaa04 SHA-256: 471fbeb56e3f249e33140a110ed4cded2458b0d9437ddef52f6394b9ae81207d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d4d3f59acafdde6a4559d22a74fa7334/kirigovubipuxetidirinuko.pdf In PDF document text
    • http://shinex-auto.com/userfiles/file/ridolivezatufiso.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vitilade.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/ranuv.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/wizadafapep.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/firogapuf.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/98958969017.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/50487733011.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/89850291864.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/8117505961.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/goxamakejikuxotu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/tibejtak434a7je007eakv8e6l/xamorisiderusiv.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3be9611eb1---84495426212.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/90418822672.pdfIn PDF document text
    • http://anupbolivia.com/images/files/maxadabo.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ladawafebosonap.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8b9693d7d525a16b9eceeb5ec85141c/42085094157.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e958bf3cc---56573501236.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34b4213d1---58215505150.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c3b29db9---menuv.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612372697aef1---76245454847.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b551f1a6---dujamuforapad.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd845c69ebb---rojamep.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/97012044368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=practice+act+test+with+answers+pdfPDF 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
stream_003_off0000d772.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD772 10640 bytes
SHA-256: 5ab19e0afb63a414971f3428252fb19954092982d1b0f16e9dc21937fecba2b4
font_00_sfnt_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16804 bytes
SHA-256: 70f8e98ed7bb41a441c4179d82f349921cadc644f0b7a9facf5a6ff14ff76382

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