Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd4538130d980fc…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 00:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e42a1cb327220d5968f4ff2cd864e290 SHA-1: fcdbd01c3b8626be54f235ff9f3601ab932618d3 SHA-256: dcd4538130d980fc4013f2244665edac08a7f2f6420bf9d5c8bc6124162a05a4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. One URL specifically mentions 'brain wash game download apk', hinting at a lure for potentially unwanted or malicious software.

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://tatsolarlight.com/uploads/files/fukotoxofufovavob.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341632551aa---96784955211.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/336950869.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/68545071423.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/vofoloz.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/46868485808.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/ruzit.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/juxujebegixofomubilutel.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kakukokuvikunuropijimoje.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/54850882541.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/lunemegoluvijaboweketo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/25515de0eee94792d1671eae749c44e5/14606268744.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mevunegowororosijafipi.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/27943215333.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6133dd57d---34504277546.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/fodurelowilepokubabozadum.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021932328374667.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/janonoroko.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/vifaxagikogegegabavizagi.pdfIn PDF document text
    • http://healthywithhart.com/res/file/73120170312.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/rumejenexozusenufujor.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/73178165526.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/bufasurigazidizire.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/17479697958.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/sasugigejubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brain+wash+game+download+apkPDF 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_off0000cea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA3 17568 bytes
SHA-256: c67d0ff5c84d9620a094aaace88f03191e27468cddd4bb4c1eb207a2eab0a4a9
font_01_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 10972 bytes
SHA-256: 152c6b085416f2d18f9eddf22f5c7fcaed455c2587cfd866a1a741233d81b9ae

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