Malicious PDF — malware analysis report

Static analysis result for SHA-256 1563478cc0cff67b…

MALICIOUS

PDF

140.4 KB Created: 2021-07-14 04:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 224ee1fac8055f9484bf68dbe5a68d51 SHA-1: 68150fb6bee82a25b08753f4370d0c44ebbbc52d SHA-256: 1563478cc0cff67b30272bf999b7c6931a3df062334b8166963dfd858358d214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://allcreaturesinc.com/files/files/62356880964.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/senizunasusunerafi.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/54086021138.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u60ce4mrttl1vpndntc6rje30p/tasofi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/20989721882.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160703078d256a---toxen.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63e5e1b02---72007852702.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085426e61aed---xanukaniwevima.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4ad4661b85a87dbf2291e13567c4d30b/96236582784.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160856d38357e1---delubewageket.pdfIn PDF document text
    • http://armanetti.com/images/63098361125.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/94155618965.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/pf8umbeaedqh3b9g9eoh3v38ju/56114148982.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/34c863b1f7699cdad32f07bc954f49fa/zeguxuwazux.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87ac4280---50812108136.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad333eb706---bokapebaripujomowuzudolat.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/4394335284.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/6c9dcd81b00adcbd27926a06d2d10b76/12292258450.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/89069871864.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3163bc84---gixazozuwajiwe.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cd9705068af4bd5429d3bfa7ef2d202d/jupufozasavisuv.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b624f30d4---12311101977.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/burosasixotiwos.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef7e6b4f5---1323675238.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/doxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=square+root+of+194+simplifiedPDF 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_off0001bc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC6F 11176 bytes
SHA-256: 6b41378c4c26121195f64b9b0b2d323219378b1fd4687c13bdafc7cd5a49e174
font_01_sfnt_off0001d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE8B 20344 bytes
SHA-256: 3fb44e9a30da61616009df6136f2d8daab95a232cc6fff528fdae8848c0f1933