Malicious PDF — malware analysis report

Static analysis result for SHA-256 731821157e9670fe…

MALICIOUS

PDF

88.0 KB Created: 2021-09-05 18:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 514394f7a670c8f03b310ac92d9cd252 SHA-1: 566441eb8cc2fb9c71a1b18ae4fea92fd7ce2ca6 SHA-256: 731821157e9670fe1eb5bd2ad4326a13ed249f66cd06497cf199938fd08c5e0e
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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/007b05f38ef8b37f00246e2c8b039b97/98749224891.pdf In PDF document text
    • http://wahluenfty.com/userfiles/famajumujosegor.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/dubodulevugosulemukedasux.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/wofiwamibovanetad.pdfIn PDF document text
    • http://klinok-saintp.ru/files/fazakibewonag.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/69074932509.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4eh35t4b36qhbjkn6eq32epqnu/55500154123.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/20643354161.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/kidajaloleka.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdf4a319ab---24859813504.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a08f0b8a15fa5c967cf6ccfa7f4772e5/zefupedunikoxetinadi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2349d49924ced58319e999882907e981/43165161192.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/6271310222.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160962daf08fe8---suzomi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/putijo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160808c4056f9c---sugolorukageman.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e92a28d67---49530058505.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/abfccd476302f2ef90d3efe5a5624a3e/24159633528.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/051723b91ce2ad5c7d0b6b1da628da8e/46503039176.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a79255dd---kexanipuboke.pdfIn PDF document text
    • http://angkortaxiservice.com/userfiles/file/28355815759.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/mizuxaw.pdfIn PDF document text
    • http://novichiha.ru/pic/file/10200237775.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/pokuz.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/50654783843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=laser+absorption+spectroscopy+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/32194d18a79920ac6453848e0062f3c9/56703984607.pdfIn PDF document text
    • 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_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 18436 bytes
SHA-256: 6f59f0dfe777e76af568908414733bfac61ca5d63ea17114179b9920421fdf74
font_01_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 10776 bytes
SHA-256: 7a4812552b269469b582151d33c3cd558447e79ef95060c407ad9d830375449a
font_02_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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