Malicious PDF — malware analysis report

Static analysis result for SHA-256 16830d2af3937ab2…

MALICIOUS

PDF

90.5 KB Created: 2021-09-02 16:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35c249d7a5034e63ac75e93767f88f0a SHA-1: f52cb7a6d3b0817b51ea0243cb581901b81fadbf SHA-256: 16830d2af3937ab292e0c901db5258565737b96e27199bedd911c97f2175ec2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links. These links are hosted on compromised CMS uploads and disposable domains, suggesting a phishing or redirection campaign. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1382dd09cd01868f2320197256ef2d49/13127753466.pdf In PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mmg9jd94hvs8598r2ib66vs0j9/4227045416.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/7j9v4cb67kso5aued0e61a1n70/pigadedasiwepiwabuxad.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/553b7f9fdb5c856d1d8111b059c6390b/35470860855.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/regamibudebevufebapoxeg.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/96818821739.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/65ef8c02f2e51d5ba29c386e21f233aa/xodazuxazokawopuzabapa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ff82c0dab.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/mexezogidifajodaxesewa.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/30c9p1jiefflkjgvphliq2jat0/wodufexumibapuluxuseve.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/kulegitefiwowejekilev.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cba1c1a42---99749955323.pdfIn PDF document text
    • http://charivne.info/images/file/92123001244.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/86945018658.pdfIn PDF document text
    • http://drosamahetta.com/userfiles/file/katarilagev.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/62594224527.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62688966746.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vofumifumuwar.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4tiam8boil5dqq8ep8kgm9qj1o/36987029157.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc680a350b---34615041146.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5o80kr2hilrctqt5upm30t5t95/55749900584.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/gowigagefiwufusikevi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/97322574319.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/soxese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=principles+of+accounting+11th+edition+pdfPDF 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_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11215 11052 bytes
SHA-256: 10fd4e6c766283b49f3035eef10955d287cc39ace727ae785962495ebfa7c984
font_02_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 18948 bytes
SHA-256: 0e86438dc130eafa410ac15278db2ebe17cafd526438d85d1a2e1b29f63eddfd

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