Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8db77edfaff256…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 22:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2919c0493714e6314a81bc518a1338c6 SHA-1: 9f2799cade7bd7492a846b33c93c6a1bfb078063 SHA-256: df8db77edfaff256ef17407ffefeac189d69c950990e9b928e1ddf06959bcead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains used for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, and the document body was unreadable, limiting the ability to determine a specific payload or execution method beyond the link redirection.

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://softwarefactory.nl/images/file/13659656865.pdf In PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kalakulodovizorakavubin.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/af29e68385bc97393cff9dca0e87354d/3526605156.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/16537004301.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1a49cde0---35116626600.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/sugut.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/nurisil.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/92003076028.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/82110700994.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/20a2adfbbc04a8dcff43a2f40c95e5df/39956441679.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6dd1ebf21---rejuzexuzo.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/4154671325.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/zimexavivavuwi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c61656b616f---wilugaxukokabofisasagarum.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aba1fe13ad8---lebetizaxijudafiwu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/55498845162.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f09140d1328b506c836d9e1fe9ecf229/17032589333.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8846eec420---83826958700.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/93038086550.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vigukis.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/varapeve.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/57152821406.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/0dbg99gq67j2v4b1i9gaqgjrpo/numanuneviwomesuloxafebaj.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/80325829015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mathematical+physics+by+gupta+pdf+free+downloadPDF 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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 18096 bytes
SHA-256: 394b6bc21785092fda79ce729641eab3f8f1ce1dfc12c57ec27412b9d23fb8be
font_01_sfnt_off00011351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 11500 bytes
SHA-256: 4bb6a9adf715fcdedb23fbe83b63f0b2a68f4c0e2add56cb3b2d99729ca38af0
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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