Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca53a0e93fdf98ad…

MALICIOUS

PDF

105.0 KB Created: 2021-05-26 18:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6fe1d904fc44967468183c7eb9eb0992 SHA-1: 3b2aa8829e240018a6a04b769def4ce78eaeed4d SHA-256: ca53a0e93fdf98ad96c2af6cba1b6095fb53dd882757fb18b499c3d3ec0c538f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite one being marked benign, contribute to the overall pattern of directing users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.deopendeur.org/imgUser/file/pavusu.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/235f3a83590546bd107be711ef778c7d/gepajerodupiti.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/taf4gkgcl1ricmm4evu33830q6/pigajirufifejuvolevexen.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/232674139b7e01f11d8cfa31e1ded30a/fixezodajub.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/voramodimitesavewi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40b52c765---lusemifufoke.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/052e2290718a3aecdb1487ac26857f88/naberevafe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071470b92941---65559180420.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/paxifufowijurojo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e5271bd---sunilipopikigep.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5c0ff0ca4f135c54079402ad60b883a1/27247145801.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xegirizabukazubanotuxo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608338a81de81---7602809724.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c8014ec9d64b717d6561b4269d4fc0e7/5813431907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+use+laplink+pcmover+pro+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEF 5396 bytes
SHA-256: c39115fc376cfd1c8eead19d39128e60a6d1ccaf9898389b850c474b24297715
font_01_sfnt_off00016e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E49 11952 bytes
SHA-256: 6532cc18a5e731605106a5ebbd244ad97978d3bffe509be725960b87f3c12315