Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a51f0d6e95b708e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 00:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 307399778155784175e66846474e3688 SHA-1: e87da0fdffedb9cb8f13ebbcb609446e7de93c60 SHA-256: 9a51f0d6e95b708ef7ae29524b00e0b12d03a69bf013fdafea4df3e2a2ef84fb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS upload directories or disposable hosting, suggesting an attempt to host malicious content or redirect users. The PDF structure itself does not contain readable content, but the presence of numerous external links strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hodinovysoused.cz/upload/file/74570642359.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://tcihk.com/userfiles/14987433420.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/69862272317.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd06476f0---71824616910.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/16096162855.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/sokudezodebe.pdfIn PDF document text
    • http://koutingchina.com/upload/files/11032690715.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/99215862820.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/mubojazedepese.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/99975086291.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/faxabiziduxorofajemido.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136b77a5ac04---takutifasifit.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/wosusejomalinetatapuv.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/m06oplfueods03sivjmi5gjogt/rivasimabubejex.pdfIn PDF document text
    • http://ha-sine.com/d/files/saramelegevoxawudidikufi.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/79546688547.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/gopedowus.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/25715578969.pdfIn PDF document text
    • http://machin.kr/userData/board/file/85884559653.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/72180470206.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/gomifedotenevixo.pdfIn PDF document text
    • http://strahyi.ru/images/file/37745782059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+theme+for+androidPDF 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17656 bytes
SHA-256: 68b8607464eb9dfab7bfe3ffc0c6cdd4fd7b9438902195e249f08aaa263087a0
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 10480 bytes
SHA-256: 61d2b0da92fa8e3306eb94de33777c196e6e2b073b64dce13f1b029f5547d5ed

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