Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1985ea0b95fda6e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 20:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dae438d08946a80c9318f3106c49ae14 SHA-1: 9566ef87f77439727f4b4ac259a2b9dbb3d557cb SHA-256: b1985ea0b95fda6e680fce1dac9c41f50d5ed030477da4abfdb7bc2c265078c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://cottonweb.net/userfiles/file/pepozumidudebovufoxiva.pdf In PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/safodi.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/jedibitokanivifalafup.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143c122f0e52---vukudakaxowazowabuno.pdfIn PDF document text
    • https://peterdegendt.be/file/75397238471.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/78734756188.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140771d15c7b---24626203957.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93268812022.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/65415077116.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/83406342005.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/jigomegurogesavomevameran.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210910004549.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/nafagumakexevuj.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5c022e6e53d9df10e661e0d0aa6604c3/31025520086.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/050649372520.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a05981f28---gagitezatiz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6141a4efa---tufukorepipofuvuk.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tazusotalosutokilij.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/523876e638f8ee1df6ebdeba9e4b9015.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9p82alsqdetsrkg4d88smoug26/kinadugizinevujuj.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/kamuzob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=excel+convert+degrees+to+radiansPDF 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_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17916 bytes
SHA-256: 51c6518d30ca14f692263201bdc07d7e1d6ff7e4eabf47c214c0956f93f6456a
font_02_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 10696 bytes
SHA-256: 17507fd4092404831f835f123611696d3fc7308350dd5517167635458e8696f5

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