Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e4cc50fb0a9514…

MALICIOUS

PDF

77.3 KB Created: 2021-09-27 20:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf8ef48b8990cf58fa173b7752f44825 SHA-1: 98cc4980b6e34a594a1d8478eaf324fb6aebf7f8 SHA-256: 16e4cc50fb0a9514e64e486de780bd3b38fecb5427e880258622d285f3c7ebc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://riondene.ch/img/uploads/file/95343081496.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/zamesixebujenabu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/bibikaramikubi.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/kodaxewusovalutedojebakeb.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/laselinatedodijavazaki.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/samilikogozibakavobuv.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/36569765038.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/kozivixemodafizujoroxu.pdfIn PDF document text
    • https://basisnomor.com/contents/files/79702193834.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/muneris.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rodumolinosotudifujidi.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fawopebitegesugitejip.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/furovadavu.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/57739831474.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b597d0315d---43639691432.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/29934117570.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356fafeb8c0---92672598117.pdfIn PDF document text
    • http://canadianrockies.info/files/file/papubobosalekavexuduzodag.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eba056732b8da433a89ce0cf8be2fcd6/43881162438.pdfIn PDF document text
    • http://myredm.ru/uploads/file/93142970226.pdfIn PDF document text
    • https://5uempat.com/contents/files/tulapapi.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gumutagukat.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b51c55cdde---zowajogobane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+apk+gta+sa+cheaterPDF 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_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 20784 bytes
SHA-256: 254fa6f56fb51a69bb0243aeb39a2c175a84a9e650cbe7683f867b9a61b2dea9
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 10880 bytes
SHA-256: 20f2a20bef027d2ea5f077044f2bb677948478837c5c10a512098f3480530753

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