Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd537ec0b7c5a7ae…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 04:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38aecfed775fd6722418ac3e388d59d6 SHA-1: 1a09fdfe4346fb1c8148ccc81f6fff0f4bf739bc SHA-256: bd537ec0b7c5a7ae849e6cfcbc4b4e0ab930af71cc276d286522d692480d3f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/05f8023a3ab45a5ee14cfa3b2f397ee0/82475652483.pdf In PDF document text
    • http://adria-ex.com/images/blog//file/67858980959.pdfIn PDF document text
    • https://doitoutdoorz.com/file/HAt3oOTRPlCqd9de.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/93498741706.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/77168518967.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/c9b9e9b9062f073decb68bc0ab5ff44a/bifobokamesukukap.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3d1982926a28a5eee00c722d8f3919c9/kitelitavazexixumuwo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1qh4vb6dorrrhkvmrttpa4ip1a/37397857765.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/gobumibogulanipomokog.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/10199759858.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e287d0a98f---rirekumivumipalew.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/wurufurog.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96212448d---8472943645.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/52262993967.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/44562255673.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef6145dfb3c9156dcb9c21ef678db950/livumi.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/jiwivuje.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/41425139624.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/muagqe0e6vj01cuil3dm3j0u9r/34578268990.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/53v2k6pre8lirvvjklvgeap055/tusiwapafikovo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c4bced31d50dc2e003aef1ac43a0bc3/45448935864.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/62445156557.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91e2d474a.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/38078936458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+flu+korean+full+movie+2013+english+subtitles+free+downloadPDF 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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 17544 bytes
SHA-256: f92945b830d3028ef1022d668c2109c5490ad536fef50cd5fa1da6714694648e
font_01_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 11716 bytes
SHA-256: e9291769c7e88596caf623c08886fefca4e0de4422908d9bea85a65b6dc24bdb
font_02_sfnt_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1