Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6aef672d0daf75…

MALICIOUS

PDF

97.3 KB Created: 2021-09-02 23:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 126c43fcbc770080d604065cad3e092b SHA-1: b4e7865ac23bd65be960e90f6d5322d3abd6c844 SHA-256: cb6aef672d0daf75d0d76bc3f0c082e9927bbb5346a1d1102cf761e1a31cf00e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various external URLs hosted on potentially compromised or disposable domains. The presence of a 'Download Now' lure further suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kstarsmall.net/userfiles/file///4589361809.pdf In PDF document text
    • http://azizolace.cz/images/file/lexerum.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fee109d9dfda17af1d5fd728bba313d2/joweguvonuwojidejuwatuju.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16100178f23c2d---tuxirufiwesapogu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/34570486965.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/93650404729.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/komimofopoko.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124bf77bd1fa---femibukevanemem.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/4711723914.pdfIn PDF document text
    • http://rotterdampools.com/contents//files/38248974668.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/limuxegumerugimovekib.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/55023887415.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e667b7d04b8---55704374009.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30d5d7dde---nobuzujamimilawadusolu.pdfIn PDF document text
    • http://katachizu.com/img/news/files/19529004086.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/nesuw.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d7ff59377---tijidelenab.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aa18a380f6af93215e368b26d116f33c/lirit.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/memobuwikodosiwelu.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac0b9321e---98290942158.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73f2135a7---95522319113.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/82144245598.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/74149954158.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/83da156976acaa0818bb0a6d0ff1e1e3/81785234096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=passing+chords+on+piano%2FpdfPDF 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_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 19616 bytes
SHA-256: 384e32e59cbc2d9a4900f0483cbe4ff2e59fd25250d1ed4e2bbb4db17b997e24
font_01_sfnt_off00014739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F50 10660 bytes
SHA-256: c13d0c848a5f95deb22baa8e6983faae2ebde6231187b9b01ebc39b920ab905c

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