Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f84b7e20e726eb…

MALICIOUS

PDF

77.2 KB Created: 2021-07-03 02:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6d70a4f16c62aa43d4a4cd6d88f6fcc SHA-1: 86e10d74df6a56d4d0211970af8ecf133f7d392a SHA-256: 55f84b7e20e726eb238763c797517910b72541db574a02e16a210362fe9e49b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The presence of these links suggests the document's primary purpose is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=cot+inverse+x+ka+differentiation PDF link annotation
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074341a626b5---jiwamogenotekanadajokeme.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/b6h4t2ij4c6qq5gj5e76gsf92l/natitoloti.pdfIn PDF document text
    • http://wenxuezj.com/images/File/97555265356.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/nezibotazazarorizibumo.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/maxusubejirobi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b05fbe653b42d6c037119108e24d6f63/fujakivesutojit.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6man2ajrj146517ts3qv1p4s5h/xoxirepamo.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/tibaronudobuwoxumofij.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/72107361438.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8214ced77---79655772399.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d1cf3519bfed8a6dbaa708c7ad30d149/51183296350.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mituvexux.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/59559121403.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6efa1cc462---pusezonewimexo.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/bimefedesevikamote.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebbdcaf1e---sedogewanut.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/22686290094.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc307bf25a---zupiwomezizinerateladobo.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/e48b20b87ce93862f7f57097ae252825/zezorobaborelabolanuxex.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dagapidulajosirexedijax.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/ruxipazidezu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/heaum82d5mjnujfskeuotf6m9i/foxizonubijofekez.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609068d4cec56---molavabepolutoromifarolum.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930feb88ef---gavaluxegowikafisevet.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/cabb46f898cf67eb8dda52091199f79b/xibukirepaponi.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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17044 bytes
SHA-256: b55ae13c9e4bc8c4dd57c702315e44757a669b247b126b402bbd6e41ef93fd78
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10592 bytes
SHA-256: 8adfbc8374d84f2be6c35964470f8a0abd207e6f961bfea88c94dd9732721aa7

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