Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa661d36e1f099f1…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 16:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee97cc8cb16db7f6db3dc9bd2d94c999 SHA-1: 2785625dc9479cdb4eafa1cc560709930a8f58c2 SHA-256: fa661d36e1f099f127259beb775839162383484ac34e3007cd970d6d4056bd77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://flardochform.se/userfiles/file/sajexefodav.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s2o2sunk6t7ii3hbl3tf85e6h7/39892475083.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/87552012655.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/fewupazubalowemazuxaduded.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/ronaduvadewujofi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e29588514fd369eedc344fb75e7f18b0/93171534736.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/wugedalololokirotap.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/menitusowigidinibirok.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/zewozusupupilosojav.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/venofanojafupuzaf.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f5495e49acf---podowekajibapeladup.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/94181249949.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e9kffant8p1ql4busf39rin3qf/54480483351.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/28007352522.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94333a2d22---lovezufowo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tefikareri.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7586493fcbc501e73742b898ff5d4569/jopifebosinazuvamek.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607904ea6ac9d---68391029533.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qkgpeiaigno4shkfv18eb41kci/tidiwutulimarisutu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/jomovuzewituvugaxutugeva.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/28758408601.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/murag.pdfIn PDF document text
    • http://traviet36.com/upload/files/18094893443.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/48239600545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=natural+wastewater+treatment+systems+pdfPDF 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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16452 bytes
SHA-256: 0cfdae79abfd0ddd4ecf73c813ec626c41643aba813bcc4dcd19ea06815e2409
font_01_sfnt_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10724 bytes
SHA-256: d8c796aa41a50cfb97ecc493856b1bc17e653df180f2335ee018e9b2d01330f3
font_02_sfnt_off00011378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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