Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddf3f0a829a41e8…

MALICIOUS

PDF

93.2 KB Created: 2021-09-18 20:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fc6e89b25ce2dda60f479259e1d5f00 SHA-1: a056eeef9e12e534a127806209d0048fbc005921 SHA-256: 1ddf3f0a829a41e88ddf99c572935f73b5709730246de6f263c75269cf084895
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://alphanaturehk.com/userfiles/file/3896961918.pdf In PDF document text
    • http://generaldistco.com/images/file/46591668010.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/sorivojurorevopemegale.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/60122314884.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144b5bd132ff---siwumibutetapufemilaza.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/16302961825.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/74578248504.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/13658920655.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/47935992147.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/musekubajisunugajemuxigax.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98617912734.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109061329573279.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/96295590912.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/93086862656.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/japekonexilelewesixa.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/takudaruzejomu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/kudorururowodo.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/bofupudelosebojun.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/54796043525.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143a993ee680---14394924102.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mobinose.pdfIn PDF document text
    • http://fxmeat.com/upload/file/4c1f2848939815136169a71994268110.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/69968220117.pdfIn PDF document text
    • http://zuszdounky.cz/files/tovutelesejinikib.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4b878b6d3a97677e25c33c9bf13b10c4/73897479245.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/toruvibod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=actors+from+clash+of+the+titansPDF 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_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 10584 bytes
SHA-256: 71a967bc9825aec3db4c9e4a3a2e03a1b9f8219c5023aba6774e7c845e597245
font_02_sfnt_off000135cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CB 18768 bytes
SHA-256: 1487ad98bccf5aac6670b9cd11be768163b8e8a09aec91fa14f2f7b9b64d98bc