Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7e56a429c537e5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 00:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 499f36260c6a247620023b81b89e7814 SHA-1: 71f3a961e90ca7be1d01f4c22bf63db2428e4535 SHA-256: dd7e56a429c537e5ae9d7ae4714de12aabdb94dd1eecae091d94c5b9f7532641
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=horse+racing+betting+prices PDF link annotation
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfc7744b7---gunufax.pdfIn PDF document text
    • http://envigest.cz/upload/file/10768587907.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c75412b6f0470060691d98d3d7a579a0/fexixozewepudosu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/52097698133.pdfIn PDF document text
    • http://kelvista.lt/images/files/69018278515.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/xixukevijatoleti.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161208b11ce0f2---mokes.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be8ac04e7aa---mexaroritewufanefoweriw.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/bkkvf6aaqfst1po4il2qqea6ot/22850821909.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/66197842494.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/nupumupinodoxefiwa.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/bukoxadegitugisefopina.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae633039a95---rerobixaz.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/figelu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/22257174909.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afeaf38a3fe---68286023689.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/pomewineputesipazix.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d3ae8640---xamifeguzanabuwiregaz.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/66602200078.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/d1c8b14943abbd4ac004da3bd17284c8/jikus.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/48903654440.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607901d4a002f---48723086707.pdfIn PDF document text
    • http://yuha.be/_files/file/48703233673.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/10582592082.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/sizizifetigasimoduta.pdfIn PDF document text
    • 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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 17976 bytes
SHA-256: 3ae8a26dd7c404580f11868512aed99658ed459e5420b90050e497b25e2ce97f
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 10632 bytes
SHA-256: 5999006fafc65412555acc72eeb833d2f92f7daf1bd41dde094e18d84d2a35fa

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