Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbba9b15d35adb9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 16:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00e214641f3af17a78a831207264d0b8 SHA-1: 6b8c6c0ff4e6bf1bd31f6d31857219aed161523c SHA-256: cfbba9b15d35adb9ab87da92876169051a5e07aa103250a945ac85bd0d946878
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised CMS uploads or disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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 http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/betemifozunax.pdf In PDF document text
    • http://cissi.it/userfiles/files/doreraripefebupowofal.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/zuwagumop.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vegixizilufuvot.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/b1a91bbda900c59304a2c63eb98b8e90/lepegiwidatewut.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/78305504025.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xozefipozubuxudesu.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/70046115967.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/lipufapotenotituw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a69082d73a---30519126202.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/lamevifog.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/laxijam.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/81535726621.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/gimeganuvobokurope.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9t4t7gk813hun5ksc2tpul0r5l/fisigufoto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/vuwiginutewo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/20836262570.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/850a470ea7b6d89b2f2d03ac57add214/fuveruxe.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/16733481426.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2959a10274af2b700e48c414bd06de5c/wenafobo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71881369757.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16126f5a565c1b---rekosefugizubivebonovusuz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c9a35938b---86644870045.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6db6d79be22209ed053f46636427de0f/mevenovogoka.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/pavabosapesawiniwapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sapling+learning+principles+of+microeconomics+answersPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10884 bytes
SHA-256: fdddd0420cc9700d0a5ed183fd9a91d8a78d761a994c6b4a9d46e9e804d1094b
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 17280 bytes
SHA-256: 93674892e70798bc8b2df75a0b0ee7ac3a8e994cd46a6423cabcdb6dddef3b15

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