Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d21e7c789cf20c…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 17:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03620f6abe12c3bc7a9546ddb7a0a491 SHA-1: 367df0254ec2be6731fcfd25e6643b94c7617541 SHA-256: 94d21e7c789cf20cc3b29a4cfccb7e00147b3bcca77f53d250a091483086925c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection for phishing and trojan activity. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not directly visible in the DOC BODY, is implied by the PDF context and contributes to the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://medvor.ru/uplcv?utm_term=last+day+on+earth+multiplayer+hack PDF link annotation
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609daee18064f---84808451249.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/sn9avbhgd3080vfa459sou72l3/54535676780.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/mekewarufevo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32f5b65c---tujopuxulisidarize.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vavokinef.pdfIn PDF document text
    • http://efrex.cz/files/file/juketirefedufidinebada.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752a2f5ef85---34512325634.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f316f18f38de696d893503d1da8d4796/nonidurazuni.pdfIn PDF document text
    • https://codecs.ro/images/file/nireboxijozabu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xapikuwiz.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0de42df038f9bc84d97dc001f356429c/letumoxevevegasetogilupis.pdfIn PDF document text
    • http://mahlkoenig.nl/app/webroot/files/userfiles/files/zikupumola.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0757a24cd9---vuganiboruwamirujifa.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/91905383288.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/257jour8lqca6m8gmfgudgttrk/mewelopajinitig.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/penigen.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce34ce25e---27212542046.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8a4af369---94783757079.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a416c397a7---mejunekasunisirawopew.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ae35cd0eaecd1d35c2183813727ffc64/xafukidas.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce847fc64c7---pitipar.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/81bsjf817jbfmkam12jr44iva2/38743672746.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/59677447823.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_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 21732 bytes
SHA-256: 68c751c81a89dec5cf702c51d3ffd9d508463ef1b54f032241f84e4993973d66
font_02_sfnt_off00015281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15281 11044 bytes
SHA-256: de513531395a08702c6127309f02662c6814a3f70a62a11fbc5c9f9bd69577ea