Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50bc72aca785967…

MALICIOUS

PDF

88.2 KB Created: 2021-09-13 08:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f56d8fa2abe691e93b34abf80d3be0d4 SHA-1: 889b48b36d02655ee06c7d935ad43a13d432523b SHA-256: b50bc72aca7859675227e5f58fa9ad097f7814aa6a0efb191f661c83c3c77a74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3c1a51d4dc15ff36654cb0215f67f8cf/patowez.pdf In PDF document text
    • http://gonganmi.com/userfiles/file/23824560997.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/8623555523.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe700ea96---14547962309.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/lutasajetojatodireganomav.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/pozamitesavaje.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e622296286---xamoridewajogatavasixune.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/dobalufiwidawiwuxazuj.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1089f73f5888c8c0cad45a24223afb8c/migagewejokibilizupi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/dodoxujidolaje.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zajadegirusajolovefe.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/ludabufiluwigosudub.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/97704097252.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/badaduzal.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132fba86943d---nugefonukes.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210906_022004.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/78251699826.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/11970424531.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/xazelekuzexaxekovejix.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/50f5e266107f42b7df969d061f8ddea3/11158148272.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/80585221164.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41268991611.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/wekaferudijavivazaxisulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=after+2019+watch+free+onlinePDF 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_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 18928 bytes
SHA-256: 0d8d52d347b89a960e158a4513990de57a9d838bf786862d01a99fa2c53ad87d
font_01_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 10792 bytes
SHA-256: 69cb50c6f1838f5432abcb558d2390e858f9bfcf2a2e7498744a5456cb92f435
font_02_sfnt_off00013b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1