Malicious PDF — malware analysis report

Static analysis result for SHA-256 423e1e294a73d206…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 08:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d547efa210ad808e37f685dd97e7bd8 SHA-1: 898ff2134db384384d249b1aa90220a6e325825a SHA-256: 423e1e294a73d206816a7e1bd5345f1ec13cf4813eb7d9314e87e7abac73b00b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cuisinescartier.ca/upload/editor/file/56426572454.pdf In PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/dododoraxo.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/nalapudedisejiduza.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/5354632957.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909224926173797.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/hvu9mmv1v4icga9nvmiuaj78ul/97818038097.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1631274657.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/selifawavobobufif.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/nofosivegunegijereja.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/sunalomodepasitano.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/lutukeridanotige.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/tuzevofevenukun.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ba2229233308ca086db9ded8cdcff2d2/37987105108.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dutafotenuvawugegowab.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/36405157139.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/67715078037.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddfbf17b60---23041424022.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303bb87c16c---gexulowilodum.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/dikojitejogelekize.pdfIn PDF document text
    • http://laserinnsbruck.com/static/81129858444.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/71990813554.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/zulezakibonebumamisoruv.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/siwugabix.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ae03a870fa4846222e2661a56e99bcf0/veridugasut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=naruto+senki+ultimate+ninja+storm+4+mod+apk+downloadPDF 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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 11016 bytes
SHA-256: ec4f634368d4778019c22825e43f9ccfc1c814bf979f67a5011f480c1666d260
font_01_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 18136 bytes
SHA-256: 27ac45d12d35439632151fba397352b01ecf0a11785dbacbe3379518934de9c5
font_02_sfnt_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1