Malicious PDF — malware analysis report

Static analysis result for SHA-256 733fd809ade70767…

MALICIOUS

PDF

72.5 KB Created: 2021-09-11 14:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0281b504cb33cc42f86f82f42adb1fad SHA-1: f05123547daa622306df69ca4d639838a49f6ddd SHA-256: 733fd809ade7076774f816444e136e2db49bdb28e23f450a5413d3667e423aee
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many hosted on domains flagged as link farms or potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked files. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URLs and heuristic firings.

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 http://tubelessons.net/cms_images/file/8015840275.pdf In PDF document text
    • https://petribax.nl/userfiles/file/nidavesifitonovan.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/werupizulonogawawafe.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/42992085454.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/melexukuxulowidevikenav.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xenokilizixoxolerexisaj.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/54883433449.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210906_F3F22E738A599A09.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344d3b28a63---jonexutidurolufoxugebuled.pdfIn PDF document text
    • https://advik.net/userfiles/file/sunimobumamuxobo.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/winewov.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/87586872790.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wakorerikibegox.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/pumaboxobolewikuvab.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/samejuki.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jufizagejuw.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/fusezuboluwopaladeweweti.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/94178177561.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540875e9f9---bolegotofenuwag.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2t459rpjs1so2alskngvgp092s/68878754706.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cca9878eb---13094629921.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vajoluxuninojodaveg.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/85522639379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jeu+bien+pour+androidPDF 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_off0000bc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 10304 bytes
SHA-256: 97ecf90c86fb6bd3de0dd4d7f80e0295a21f664a2dc584e6421e773e76e676ae
font_01_sfnt_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 16700 bytes
SHA-256: 285cdd23019fb1a5619e9ba802ac965511f04df343a570ab93b78b268824c42d
font_02_sfnt_off0000fc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.