Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b29b3d2c0773ea…

MALICIOUS

PDF

82.2 KB Created: 2021-08-21 18:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d4f50d3543517f8c376b0e1ea153445 SHA-1: 11b9997f1f43e01474830b5f8ce98c7a3f09da7e SHA-256: 70b29b3d2c0773eadb3a0e68241081641752139041c4cfec8a6b853926850ea3
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sushiosushi.com/uploads/files/36264731773.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/748b49d640de05e79ad4f9c2c2e98667/vajevazejinuvatevunifes.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1fb199565bb5cd099c99ee9e12b9e772/ziseju.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/eca66735823ac7fd765ac8caaa0d692f/nulafenaxidazadetefesudux.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b31a6304---legutevogikirutomurunok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087070af2b38---sivetafimezuzefogon.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c9addecb49f084fa44cc0fbe40ada754/patazivigejewuvanoxu.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/toxiranibagulitobasogixem.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1662d039fb---60153389005.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/dipilanevuwasu.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202172492728.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdb4c1377---42437924598.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dokuzuxewusurokuzuvu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739ab3509f9---sanekukifilogajupokugab.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/32917724700.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/33316bd51c6ee2a495200cdd78be4ee4/dexesanulosesirusepu.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/30777757003.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/20303364260.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/59925660352.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160737be15d24f---zewobobebavuxepuz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vos6co53nhsolvl9pr60frqe73/zotevoned.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16120623e080f6---87802233098.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094487b86ed0---virugivamunejafisemirowok.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fa93789387f74329e702ee511ad49004/78652102894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+clean+printer+heads+canon+mx922PDF 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_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16676 bytes
SHA-256: 1832d6cdfe26cde0529758c0d64e12c8eabcad5cdd6df213bc701237f36e25ce
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 11244 bytes
SHA-256: 06ee9ef144a44641b638d768eed90d62c2ac66891cef4a19939f8c17b1d25db7

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