Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e3f4a99d742864…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 062f18f48abc0175d73b64662e79287b SHA-1: 404c6a55210bdcfd589a48d98b7ea937934d3631 SHA-256: c8e3f4a99d742864f40e6e9cb72813aa1135fae3aaf6ec9c3087e35dd3c59133
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous embedded URLs suggests an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://oawebserver.com/piceditor/file/26858951062.pdf In PDF document text
    • https://bursakaynak.net/userfiles/file/73667203550.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79465951215.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/40018533275.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r500ue66d1abevmoek28ka9vcv/wivevepel.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3eea8c8522492feeaf6636f53454d763/duwanuzuwowo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/58875167334.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/40a7b6dcf4547edde8f9f89ccc8dafb0/3310998321.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da05fe0a86.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051510115673499.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/kukopegitix.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/455edb6f76040f5a85ce0c3ac67841d1/8697805007.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0195700001619798082.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/43640508983.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e9acf536b5361598e462f4ea3a1e3c4e/terobipoxomaga.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/zatifakufisazajimatorogep.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f934f14730---32269732456.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5f7ce54b2a5a0f8a19adebef196e2548/munoka.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/81195272235.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d56b0705613974bdb324103c85fe5205/85208085843.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/4ca9192226f45600c994bbe435f170f7/94367158642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=eugen+sandow+system+of+physical+training+pdfPDF link annotation
    • 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_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 18720 bytes
SHA-256: 6dd65fa78f60731a6e4635e64c97f380abcfd9a286bdc8c3f95a064c893a396a
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 11352 bytes
SHA-256: 1451406e61922b9d9e5222eb30aef48773f5a681009004e5400cfc823ca8cb2f
font_02_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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