Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d689eca304a74b…

MALICIOUS

PDF

88.9 KB Created: 2021-10-12 12:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fe7469b493b8dfe1a68d3398ab654953 SHA-1: 3f9c41aa7e89fc0c8b44dd77cfc72f2ad8c0d8f8 SHA-256: 35d689eca304a74bd1054b5b2ebedc041740a5e89384ac6962037fffec8ff26e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/95790123939.pdf In PDF document text
    • https://mysilo.com/upload/ckfinder/files/kupajupanukumovasitakivaj.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/74807959918.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/75512041039.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/43983727816.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/nusiguror.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161440156221da---lagoginusebakorez.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed90f3e3---jemidoridimuku.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/saxegajutuxodukazixu.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/47947089397.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/voporesipulejepeg.pdfIn PDF document text
    • http://gerocuki.hu/user/file/padenurulosif.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/u7hb88h1tjd2bu8ffuf34st2ee/97256200398.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/gamizakofopi.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/zeveboga.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/45016134472.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/92690407823.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/2110995985613f11564b2a4.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_D01126E2F50B21E6.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/69096316062.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/fagududupujel.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615f29ec53fa1---fujekazagopirebirezavu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/28375337078.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021100506233073499.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=texting+and+driving+ticket+costPDF 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_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 10720 bytes
SHA-256: 4a70d89de29c8d16f129201f1ec5541661b1269888143ac5449a825988263a05
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 19540 bytes
SHA-256: f14832c1285a6709f09f754915a1bf82e4121565a63daaeefd7a767e884c92b4
font_02_sfnt_off00013dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1