Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e0d3081bc89ef1…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 05:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b555bb5e58610af7f11d00e3504f1268 SHA-1: 9a998f37a7b0f34ba12bb373e58867c7203d1e34 SHA-256: d6e0d3081bc89ef19b92c99a78c96cc51acd2d79f6f2811d0ccb447b38c29d65
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://veno2.com/upload/59649696264.pdf In PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/62877230860.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/tekekenizekikilizoxa.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd19cbec6---zoxigudurulaworafegim.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/fisiviworofewipiganipukaw.pdfIn PDF document text
    • http://abwessex.com/uploads/files/moruxejukarotisokora.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/jefunuraguzepaz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/krhs5aac6ese6n45rq0ahho40c/3675594530.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868739d6368---77736099613.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c2344ff77a90f5dfd6b46019f059870b/54597465045.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4cf2565b6---daduta.pdfIn PDF document text
    • http://apvn.info/userfiles/file/nitemirigixove.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7f7be6b6---98423781252.pdfIn PDF document text
    • http://altinay-law.com/images/file/mutarimeredepebizofom.pdfIn PDF document text
    • https://renault-service.com/userfiles/kuwotubeponovigodevos.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/25370199342.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/94069428250.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/62616663774.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/l0glgtl2b33q1v78sd09u408e1/besabukeverulilatofabujik.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210810145006.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450e8ccec4---jifinewokowadado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=set+for+life+todayPDF 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_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 10264 bytes
SHA-256: f1fce397283640cfd71b02d503d9c191508bba389ee540edf93ed7dd1e7d8823
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 17164 bytes
SHA-256: 0859923476729eaf65688d158801f50d75aa566d3ed1d65687dee7b8648d5585

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