Malicious PDF — malware analysis report

Static analysis result for SHA-256 10664911b0320c0d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 17:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16d889d676367e27d86163e60aeaa6a1 SHA-1: 880ad2186fa983039c32f3813bb04c8f63433a67 SHA-256: 10664911b0320c0dfdc9a5f76eae5989088a0c0ed2b824a59eddb4b72ca1222c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=copiar+contactos+desde+iphone+a+android PDF link annotation
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/werozapavilerodirumorewo.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/16128396217.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/jujidelumivugujotovugufut.pdfIn PDF document text
    • https://znalac.com/userfiles/file/lurewafavuneraza.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081837e91a---56326674450.pdfIn PDF document text
    • http://humanlitech.com/files/files/papukuwes.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9771212349.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa9cbe4a9---57417865189.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/dapamabawajakin.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161301830cb254---91910085945.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/wuxakepufuzedegosabumeso.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kezabasojezumotavub.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/51382679895.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/87180209542.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/2192854305.pdfIn PDF document text
    • http://zae.me/datafiles/file/31347920283.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/80130581632.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/17904856971.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/tavona.pdfIn PDF document text
    • http://c-amc.com/upload/files/sefemofefujevonapapas.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792eb03fb---doxubora.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/92016306432.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/98016897286.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_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 19544 bytes
SHA-256: c8230302acaf94b013406c7b0ad3461035a92daa964a51067506ba7706aac254
font_02_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 10596 bytes
SHA-256: 526f2a340002059309047ce793052baddb779e115a9ad4c154ff573a6ab2d347

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