Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fca19102d1b1e2d…

MALICIOUS

PDF

89.9 KB Created: 2021-08-07 13:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef8d84b7d3e8569c3e68f6840e5cdfb5 SHA-1: 811c0464afc8b8a5039c0dd951018c76cc99f89b SHA-256: 8fca19102d1b1e2d924c05800c2c1188bd81008ee6cdb376101aa20512e1cb17
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious PDF activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://cructi.ru/uplcv?utm_term=how+to+report+food+poisoning+uk PDF link annotation
    • http://koovappadyscb.com/ckfinder/userfiles/files/35104355683.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29b1e82e0---13099300931.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c279934e---86737055441.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/02na3s1vdqak2ngrkppip0gjr4/desajuwokaniguwexa.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/jezemosofikise.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0ea8e6a7fabd3208d070d9fa46002993/fajogona.pdfIn PDF document text
    • http://furniture83.com/upload/files/30574807573.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/24961247883.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/74e45869e12e4a3575dcb2c02e9ac32b/50134379280.pdfIn PDF document text
    • http://envigest.cz/upload/file/85606166637.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fc39532fb5968f2e9b21fac1c00cda73/sapemoguzanabo.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/pofopiwubaruwez.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/gejikupupakejagojumisag.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/totupewokufosani.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0fbc12ac818bb82dfd8184195e92381a/1950891886.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7671369ddfcd2af5e88d3d7c7d334e4f/46762459509.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc1b694c0---ropawixez.pdfIn PDF document text
    • http://dsagco.com/Upload/file/moxewibobepinuroromewa.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/47574964281.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/wexuwopof.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9td9v18mjk713utkiqspf8a7n6/legidamutitovusu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609141d2926bf---zuwilogupifutipepipa.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/33357183536.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ac57fc80---domibibufinorexogiforiv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e8a6b745---15092196626.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a102ad907f0---tuvokelurigoxiwuzedi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fd75c0f64---sawitevovigemudagari.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_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 10732 bytes
SHA-256: 367dea99a1fe8b4e4c87ffb951b52061e6599e7d49990dbfdc4357244e670128
font_01_sfnt_off0001133d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133D 17408 bytes
SHA-256: 230a8a01b95c856de27b86fb3094d610075261951f9ef82e0d2f08ef604d78a5
font_02_sfnt_off00014064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1