Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50193433ed9ff4b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 06:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 538a26b74d6eb6affa34c6cc8ae0965a SHA-1: f3bace8c068b04da6bf70b5096d51cd99c60f577 SHA-256: d50193433ed9ff4b74ee000617a33ea960ff9c550e6fea8e1352e72cc7074bd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF's primary purpose is to lure users to malicious external sites.

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 http://agiusfuneraldirectors.com/files/file/2268280425.pdf In PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pugewir.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/61700270679.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1lndlvmh101n559q4gqq2a3fp3/99731516458.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/dudituro.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/19208245922.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210614005932.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-24-09-32-04-66.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/rovobadamo.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zonedidugogaxodu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/40242882498.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/toziw.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4f93b3a01---21127345315.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/16618869823.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/mibotaripepobif.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/13794190440.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/77757843273.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae89a3298f---nexojimul.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/miworum.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0dc506d0d1ff0faf68413978f49363b9/36882283077.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037e0e70a2---94513941848.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lavixeje.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/xozogavipegomelujuvap.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/14204401524.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/figakisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=radio+times+archive+pdfPDF 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_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 10844 bytes
SHA-256: 8602884354e58dc9ad7d8f6482bf8f9cb7a98377e1dbdb81c5e43a76922a3e4c
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 17472 bytes
SHA-256: 0d3d82e3d7be427a85ec4c57e50284a4c3b1ee9141f185a58b72bda72443bd95
font_02_sfnt_off00013bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1