Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0f65d7bc52543a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-09 00:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7507700059ef0855ff461933f3ce334a SHA-1: 87c299861c18228eb4b3f076bc54542af51405c8 SHA-256: 0b0f65d7bc52543a214724cc3dcaea35533d48ec562f6869f3831ef5cb84b766
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. Heuristics indicate urgency lures and download buttons, common in phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing page or a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=how+can+we+retrieve+deleted+messages+from+instagram PDF link annotation
    • https://airflow-skateboards.com/upload/file/97563357292.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac795710c---nogedisidikazuvim.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d590ea92f9---nugafasedaja.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fulatotifekabafenimokoru.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/mepekeripererunelowofo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3833a6ce3f---53601613360.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7566260750.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7bfdd26a5---34450518499.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/03e4db7509ead7a38fecca461575d146/lapegobiforoxaj.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/18722468170.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/65540025829.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160712a3374ace---nadexugemuf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/otj5bk057p9eftr821ahko09ep/pekugaromotimebanipebol.pdfIn PDF document text
    • http://effektfilm.de/files/file/zevilesikapivexinadedo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/zuleladivexuvufotexupega.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/de2073c194cf1eee007d3392252126d7/1216946219.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///61835000252.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/dodatevig.pdfIn PDF document text
    • http://keramann.ru/uploads/files/wokadolinu.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/wakipixeximufijufejibope.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gominagenolobuzivorit.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/78c971e465964dd80cb9ab3e7e46d298/vabutiritagowanege.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c4bjipbs7d4u10bu2j0viftrus/57650220218.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64b42be6e---rixuwabafumoguliwajidezib.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763c3ab814f---17296333261.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/39aa85022fdfe6157a2c2e2ed22fed29/79777397196.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 17416 bytes
SHA-256: b3f56b9c4598fe304fe297484f9ae77fa46a0c3b211ece3fd3e4e41aebb84665
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10960 bytes
SHA-256: 3d6ee38730f2a3d9961c477c3c790ecb4c498d4ab4bb3664369ae27855f85cf1
font_02_sfnt_off00012d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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