Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e9f08ef165a64c…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 21:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16eaa1f60b3dfb8b8420a7eb7811b92d SHA-1: d3b83972073f836206c1fb32f4ae25a878a4d549 SHA-256: c9e9f08ef165a64c43709fdba301263952c553f3cc3cd49d43ddc106aecbc200
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute additional malicious payloads or redirect users to malicious sites. The presence of a link farm on disposable hosting, combined with multiple URLs pointing to compromised CMS upload directories, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jnnycc.org/userfiles/file/59091572313.pdf In PDF document text
    • http://newo.ru/files/files/39026836444.pdfIn PDF document text
    • http://centrons.com/uploaded/file/139078989460c5de5c184e9.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851419107ee---tijijusitupajazej.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/32872218919.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ff6f2f1---jafixelubelosipotonimij.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1f2263195c8d48971b159f606599d67e/27875750140.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eb606bcf43a8ed83d545e9a9b2e59aa2/kedikumareti.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942870e4879---80615782426.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/sevavukibuvuvadube.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/sonufesubap.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c369a00a8---nonezizax.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/43133891787.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/631b9fac23482fabc6b305367d08fd3d/35261058014.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3640dcf67d---78897651314.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/liruxirugevofuzalujurupi.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160738bb7279e7---tixanugasumibagolelaw.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d6427483---barevazupipexuloke.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/95210627326.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gurakasoden.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5e472d10ff7efac2f141d033061d59b1/43368584535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=top+tips+for+writing+a+cvPDF 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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 10592 bytes
SHA-256: f1d9fc5c55b56a89d5fde47e86a2bd2526581140603179d1897f73f1f35d32c3
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 17748 bytes
SHA-256: 0b9722ed06bbbded7cb4c154a736149ab70f2461cb28e0e43b507a0ced407775
font_02_sfnt_off0001394f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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