Malicious PDF — malware analysis report

Static analysis result for SHA-256 c303ca9c192772f5…

MALICIOUS

PDF

89.4 KB Created: 2021-08-02 02:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 438c87196a70bce36626eb4fcff34683 SHA-1: fd2559ef55889a8fe999ea6e2226e4528de601c3 SHA-256: c303ca9c192772f54494f3e6041311faf496251e0f4808fc40e38f135f06006b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ekransamara.ru/files/wofapobasilokuvuporijupe.pdf In PDF document text
    • https://aedwea.com/upload/foto/madulokagoxaw.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d421502097d---tamafarifawemumuvudifebe.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lfipp1i0mq8ra8gc4bnnb49jeb/8226029338.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/38980674704.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a45bbe4bf96---fobusoniva.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/lowapojebosapibuxaweb.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/35964480600.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ac46a53b199ae15dc6ca15ded25d563/81478405063.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3fdf36064d22e12400aa684ae82f6cc5/bezit.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/nujamoseg.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/56c1df2cc28c289ed7e96737bbfcebdd/befoxob.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3077c888d---tufasori.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/64806422299.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/ratozeximurovituzi.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/908987580.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/49800410975.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jalisidemare.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xuzepo.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a58d9147c---76818195099.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/livexabasutasim.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa001ffd8---xaloxadir.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/batufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+are+tyson+chicken+nuggets+made+out+ofPDF 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 17764 bytes
SHA-256: 4029f0bc3a04fb0e8b52eacd2e0c56922b3afb461ef34d29aa593d89a95b1d34
font_01_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D58 11176 bytes
SHA-256: 8d30c4f1f948997d8eb8fea426e45f04fb627f4b7c93a40ffd301490970e2289