Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d6261ae0f04ad…

MALICIOUS

PDF

89.6 KB Created: 2021-08-25 01:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d823e5255a6c07d07f7817fb3f754974 SHA-1: 4cfa65d42c9803a2ceb176b6000681156aa027e6 SHA-256: cb5d6261ae0f04ada4afd50a1310f390329837772a920e63b61fb18bacc1f072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. The presence of these links indicates an attempt to lure users to malicious content, aligning with spearphishing and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53363e28c---rifupivusareladunizo.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/61142168920.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099011b55046---fololafakegupupovenudob.pdfIn PDF document text
    • https://fishboat.hr/files/81665970413.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/fagetu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/98a6e9f68270c1681c1ea3e2a90c19bc/87663027291.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/wubexurevojogupinuwinobe.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/vuwepodipibobamikan.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/nariwokadupigesax.pdfIn PDF document text
    • https://asi-filter.pl/files/file/93244258395.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tubigimufipukilijizax.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/92517102275.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/94q7p5rs9t69ivvi7ioro1d547/penesagebemakede.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c614973d578---befafabusijipupuwijokan.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/83331470480.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b9944490c86a9ba0736079a1b96f2d33/tegarivido.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/tosagejonebegagugug.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fumele.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f56e518c3f3---dumugixilobaz.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/45796924090.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b4038820c7baaa9355f5084e6a6851f9/4321401253.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kovofedabukonoki.pdfIn PDF document text
    • http://sns.hu/_user/file/37930687276.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/93226669120.pdfIn PDF document text
    • https://matratva.in/userfiles/file/73581645476.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/bilomebatubapadogojidule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=standard+catalog+of+smith+and+wesson+serial+numbersPDF 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
font_00_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 18452 bytes
SHA-256: b0befa11e9329dd02a2d5ad83011339c6bec3b5eaacb7950245b7c6aac598af4
font_01_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 11324 bytes
SHA-256: 55ea2159520e44d7d44e9b1ef5102f228f79927fdbe57e391e982e205eeaf916
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1