Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce0d3498bbd1ae1…

MALICIOUS

PDF

74.5 KB Created: 2021-09-14 02:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2dc21422e0892a597003ab1c83d6c24 SHA-1: f9b2b1390e382869e0325a88ef2d9e1fa8adf175 SHA-256: fce0d3498bbd1ae1b1239ae10a2f3c192f6b7fa0182567ce19b1a9c0609157a1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to compromised websites, suggesting an attempt to trick the user into downloading a malicious payload. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/rumujuli.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f797b81915---pegokerovuxo.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109091609493897.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/44414379911.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dunorapujuwamukilemi.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xasexap.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/13723214823.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/vakerat.pdfIn PDF document text
    • http://rapet.hu/files/fagerepenof.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cgvn8iu744gcjhldovvfn1u924/zanifodilipomizobit.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/bebexepajovomodizum.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3aea68a8---46198203822.pdfIn PDF document text
    • http://stroi-sistema.ru/img/75164734080.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/vajepuzuxan.pdfIn PDF document text
    • http://stylekd.ru/files/xejuwulugiradikinubebabi.pdfIn PDF document text
    • http://metallpress.ru/files/jedopeki.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/kizibidivumagetoperum.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/sakinajexup.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/67437592552.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbde014bb8---bomugosulumazuwakimolut.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vosumawulawowogireturabe.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/83357914161.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gajixa.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/muraj.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/todilazaxalasexelejuwa.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/6646877073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=indian+call+recording+appPDF 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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10376 bytes
SHA-256: 54cad896ffab5d2878afdc0a7b2734d9a3ea433d4cd18fe2d6ec44703779e7d8
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16528 bytes
SHA-256: 8c1ebd6b68e3d358adf90eace4f123d113bf1dace0ffa2be84868147f540da9f

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