Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd914ae1e4fa1e0…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 04:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 259358886802ac8f6d7267c0786ae8fb SHA-1: 546e8558463573192052958df998b603dcb96fd8 SHA-256: cfd914ae1e4fa1e00ae9b6880f45061f42bfcd14415c392ef2963f999e40edf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=2017+wala+vidmate PDF link annotation
    • https://bank-kredit.at/ckfinder/userfiles/files/99889977469.pdfIn PDF document text
    • http://sayarbobinaj.com/file/25253432386.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/27482638295.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/31099170578.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/90181464672.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134369ca96e7---59182629337.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614017769ad2f---dixabebonufu.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/bulepifovenaru.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/sabudajesatanob.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135980f99931---71180051902.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/tojofixedunekojotonaj.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/56625443829.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/sigoluneturezoxinaxoziwa.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/236u5mvhm2nffqk61f266bjall/waxikabar.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/35289398981.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/6087598208.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/29944424388.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4888c4rn8d3eekrabe016sjgjo/rutemenojoronunuj.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/65264582212.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/foguneleguvefip.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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 10316 bytes
SHA-256: aedb0d2332c8fb67a539d19a92e2e340db63da325191244ffe388693c23c8592
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 17192 bytes
SHA-256: a983e4de6103148c4577488eb7b880c3eb675208c6d912249a93f1283fb5aad1
font_02_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1