Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3264e8d5a2f919…

MALICIOUS

PDF

89.7 KB Created: 2021-07-28 11:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6648fd88ced3c34cab2144b5e5ec03cb SHA-1: 0b567a365c40cb3e20eb441d1a21426b89ebb349 SHA-256: 9c3264e8d5a2f919cc3a4ced37cf4089f1afeee6276bb7d3e6c2f2791734ea27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading further malware, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb6271064---66209842316.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1dd135a1---76210547083.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ad13d27a0bae8229be8d9e039cb40544/majavazapepukipopuzomewob.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jobabadafedujepekizeju.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbefd19ec---mikorevoxivepirafo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/sjf48f0ppiiqgkirvotlaqhdkb/tosaputopujavazizujejabin.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/lotiraxilazapuwopate.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609831b6b9031---revojajoluves.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9fcad703---pavotubatupawabewolaxedep.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb8117c96---99675578573.pdfIn PDF document text
    • http://spiregene.com/image/files/20210726_225048.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/jilatoza.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/de03d68dbb93d254d569c638e0e37e7f/danajokokewopamobupamiroj.pdfIn PDF document text
    • https://babamore.com/upload/ckfinder_temp/files/20210603143249.pdfIn PDF document text
    • http://hanifeugur.com/image/files/libobamogogesel.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/32899975183.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/0n9rnl095u4kudncmscp6alvn1/62435148388.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f4f89b357---47536154146.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb76771dec---42333179114.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107251215316323.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1tmbpopo14f8rur6b89qn3bfi4/xizadavaparujolonaro.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/vavivorulopafu.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b8f1f8321a7930ef3e7713e73b5db4c2/32554700786.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc67fee873e---buvalijudejizop.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ffebfcefedb73fad9ddc087363feea09/73495810197.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/12973397848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+adobe+acrobat+dc+%E2%80%93+pdf+reader+apk+for+androidPDF 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_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 16732 bytes
SHA-256: ef69faa4c2d34f9a3ed9f27ba4188ce72fab2b4c3684ce12533457f864bb89a0
font_02_sfnt_off00013d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D89 10796 bytes
SHA-256: 3b6aa13ef745ba3c44460960456371398d83b9058e21e263c5a046064d814ccc

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