Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8bdecadbc799c4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 04:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 24aede1be93f4c15c963858c580995c4 SHA-1: 11930ead8f816a3a8471ced171ca01bf01637c44 SHA-256: fa8bdecadbc799c482f1fb809d75e72f6b3111ea2ba9f844e8d1624807de16b7
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 https://synerhu.ru/uplcv?utm_term=call+of+duty+cold+war+cheats+xbox+one PDF link annotation
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/pofedesos.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/bijinapa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614450db70b0b---97001999051.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/28865505215.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/82947861800.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/223c56f029bf66aeb803623d8b4cff13/80529579068.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/49502260287.pdfIn PDF document text
    • http://didula.com/img/file/49511865802.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/78834336556.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/84249800493.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/18454925102.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/98765884837.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kugenutiromejetujutokuz.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/8178149357.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/20899054938.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/godosetanajoj.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bizuxu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc71ae43bf---52916955302.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jarabebew.pdfIn PDF document text
    • http://anpharma.net/upload/files/kogumexiviti.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_off0000d2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A5 17512 bytes
SHA-256: aca85efd83767020f211ea5ee33816e190705f1a1a99d372d8b80d03453c9a62
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 11056 bytes
SHA-256: 59ded94b0e9659a0ddc153c23c6e45e11aad6bf2c4439cd84943c51bbe59cdbb
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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