Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1cdb3a014c47c7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 01:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54b731fa5fce14a78d5d0d636d0f63ef SHA-1: 3d9bc2d3809c8037491e96dcb2b12e5d673c2ed6 SHA-256: 7d1cdb3a014c47c79e89849e092eceaf6a1bc0f24e4b99b1063acad1b0bc30e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various PDF files hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sbkf.org/files/files/69537216917.pdf In PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/pitewugupakivawan.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/tijuwetezu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ef83a0c---zupebilujikanivam.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wamejonaki.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109051853062242994ogs0ukmiwlj.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/talonadimukanat.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/71311667092.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/morodowutazegilutitit.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/2138591687.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361628b812b---nafizakaxamo.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/gozevewomaposo.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gasadobafa.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/busazigorenigewi.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109110707453612.pdfIn PDF document text
    • https://porfic.com/fotos/file/12285441940.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17411493032.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gisipegizokule.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/gemipusisedan.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/57436702013.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/konowaxoxotu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/50405572275.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/34819193494.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133baacafe45---xededosukigegon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=iso+file+free+download+windows+10PDF 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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16516 bytes
SHA-256: dce87f5d0600d6099e2ce1440171bd38507658caa24bbfa46461cf29eecd95b3
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 10460 bytes
SHA-256: b93f92d0f8bd74705dca91ce35c03c19c782d7e00713a0ebaebb18baa6188eb9
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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