Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2861dae33e710…

MALICIOUS

PDF

83.1 KB Created: 2021-10-18 19:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 1611820608e6667256efb3e494f6f1e3 SHA-1: aaf4e38812496d1f858ff502b4c6d2015f30391f SHA-256: 8ac2861dae33e7106e8c0b2433532c39e8b3874f450dba6986940b9b42e08e50
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://evabizz.com/userfiles/file/14838519684.pdf In PDF document text
    • https://aspit.ro/imagini_ws/59312331988.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/98603897943.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/cdf1efd45de081a9a96213e2d538f350/vorutika.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/10102701956.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/70860439760.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/lurabuwexed.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/gorulitobudixilajinofixol.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/76258928237.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/50319027954.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/lewolipapedavesaf.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/93470263677.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/27006722255.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/togiba.pdfIn PDF document text
    • https://petribax.com/userfiles/file/poxil.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/689df9c2efec201d990ad88460995dc6/xigekuwexuzof.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20211006043115.pdfIn PDF document text
    • https://birotex.rs/images/files/39387361781.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/27588089846.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/duvalapepit.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/bewuvasejorol.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16153097f579f8---63450753646.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=royce+reed+and+dwight+howardPDF 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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 19300 bytes
SHA-256: 63f72861c8250efc01ba3a6b5b86c9d6a7aa823e1da1e9c64c3ac1d93bedb484
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 10680 bytes
SHA-256: e093e6a051cbc49c91221ea33ddeef8c9bc49f7b41d0acb87b75861c19d394e3