Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd78ccf30b05000…

MALICIOUS

PDF

69.5 KB Created: 2021-08-27 20:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dd8c2bc0331674650398c3c0c0d788a SHA-1: 0c0a8255c34e23f29b7324d3ff8cf2884b458447 SHA-256: fcd78ccf30b05000a2a4632028e99a2905f29ee71a648dc1a66b768b0f1a3fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=cheat+in+clash+royale PDF link annotation
    • http://rallyteamwalraven.nl/file/82336598049.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/1058630854.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hoj6po71hgoba6vlbotglg1ba5/jawekimivogojusegu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dbf17402---87201483186.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/33472745554.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/31579463823.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210715184528.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/pugonuzisodet.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/fogazefovosozavogedozo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/80980946995.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b8872cb4---59781091024.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/623466e8a357141239b08918d7f66c99/37514421187.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wipivivaxij.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/8367996431.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3f5f26784fa627f15342cc6e7133e9c8/22850354873.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/63737947240.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/60328531091.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6ea484acd49464bdbb6b371cf6ebbec5/54808811776.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/m29a12mjalo8vdf1fdmmajjhh6/10836857330.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/61726384823.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97fd2eb43f---50969429543.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b672c2277b2---58773648607.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/sanonuzofi.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/97166409421.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/33267726437.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 14888 bytes
SHA-256: 599312b8028e9bc50aa3d3a52ae9c4e06f1e3cb3e517fe43b624d2b6f35b0b81
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10472 bytes
SHA-256: 47f487d649fd3e6fb9503e5f88e5631118202718ff58e7963d8df02f47279364
font_02_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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