Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe81dc50c85ca33d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 02:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e65e4e856e51934e50b64a6837c42a7 SHA-1: 935355b4e95da6304f941d7ab379a13d98011ff5 SHA-256: fe81dc50c85ca33d88066735f077cf6aa3574303d5496d3902cf78a38d8bdf05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/02oog4u2rvqi9ck8g427rlnii1/42447328513.pdf In PDF document text
    • https://abeess.com/userfiles/file/54285253416.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607579df9eed4---50724499879.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/60719790794.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/cdeb5de41516d88169e27180ed5f8016/71748045100.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/7431044488.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/figorugodinilirene.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/rulekibefutof.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6fac780e680a06be31e574e39cad1d7b/luwugilivosotemobiribose.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/997d67660f92284a3109113ba29f4717/zupimowagomafaxofog.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/302235195388.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/71861702133.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/sesawodapawojonow.pdfIn PDF document text
    • https://hirurgija.me//files/vurigaj.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/rifegagapuzerupuf.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c137f4805e1---31971561913.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lesof.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/vufajekewitogeresejube.pdfIn PDF document text
    • https://goodline.by/userfiles/file/12176205970.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d730a9e2---73236477373.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160860e06cfc88---14936148254.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/14986897872.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827564bf1db---lemutugefun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jet+drum+sander+manualPDF 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_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10288 bytes
SHA-256: 5026e82ebd860dc9139573913c0d142503ec5bb50fda3cbd791102b7f5cae13b
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 20164 bytes
SHA-256: c6854c800d54a221b3f1b0c0659e04c58e30e1f464ce7086f1a7f8ff1b736c0b
font_02_sfnt_off000125a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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