Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c95155f666dc383…

MALICIOUS

PDF

85.8 KB Created: 2021-08-09 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 633bcdf2e42c8485365d92ea01533e61 SHA-1: 7b0d53d9618985b822a4beb13adb13c0ecfde48c SHA-256: 5c95155f666dc383d2cd99cbb9f737a7deeda848b0e2f2c9fa1a290e8e3e9f37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm, suggesting a phishing or malware distribution scheme. The primary attack pattern involves redirecting users through these links, likely to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=free+printable+christmas+potluck+sign+up+sheet+template+word PDF link annotation
    • https://abe-rdc.com/userfiles/file/fofinuzezatiges.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/sadukoriwazuguzesava.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edc5c991f---nitag.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47393238351.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/zavanavufuruxagajow.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/zirubusixozobawulenen.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cf8cf1927---najanukuzowugexezotivam.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/gaxovopakuwazopik.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5cae22be87846ea0cdc15178ce186e86/nozofuru.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23da84d0a---33159460354.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b958fd3bd8---39939921379.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/7042920533.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/78849612842.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/dc6c9cab3c799efa70ca6bdf1a6a1837/23172345379.pdfIn PDF document text
    • http://rld-carbon.ru/file/daneluruk.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade3562c2---reboveripawesonejek.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/wusew.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/62520347348.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/4593934192.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8dccd14d4ce983cbb2cdec8e9c24b6a/50673571341.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/76571801665.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/5fbbd4a46d825b22df97a31e4164d4d9/valelimugomudimaxa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cb49706---tipufapej.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607053ca77652---45474249392.pdfIn PDF document text
    • 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_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16476 bytes
SHA-256: 932b0e7b1b54019773d5f8b9d9bbf16e5bf4f7567595bb7ee5b398d659867d71
font_01_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E35 11356 bytes
SHA-256: c8709bfe9a8cf92f5f786802bf0567668cae00bf79ed7eff48a77db897e4dcff

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