Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1fec67f5209636…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 12:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8483ee7a8c378eb023180cf081d856d7 SHA-1: eff126b7cfa11852c8293d66f51955fcec7aabed SHA-256: 9f1fec67f52096360bb21660dacf0611ca11088aa40202418e571e067f988bac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vmwarts.com/ecovic/file/bedazozizezupo.pdf In PDF document text
    • https://ayurvedaemart.com/uploads/file/sonaxofadowesazaweruki.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/jukanikalubifunututop.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/kotutanupuvuwolidawadope.pdfIn PDF document text
    • http://feast.to/upd_file/debukoresukalaboxiderag.pdfIn PDF document text
    • https://nada70.org/userfiles/file/30121742408.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1c1a8dd397b2156d29cdc8150b4dcee4/regosoxuxuzisunedokamepo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7713b031be---wexape.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161141e94d3b39---65305912996.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrh0b1f4g6kuqqfgkgl1n1f901/dofatuzosapifasa.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/72225544911.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9817e0d3---xodamatimavafosolotaxifir.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/wexipuviw.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb50918c8---5765233466.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54888368706.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/bebodafuzuvenilojix.pdfIn PDF document text
    • https://plasy.com/uploads/file/11313956540.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/vinomalu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b813fe131f---mabamuk.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/xeloximidomako.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cr8ruv1ckqk8cglenotovl0de0/84749737597.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/95313021500.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/59903568599.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2e846e428a64f305a9e7fb4ec04e65f3/1471597612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ms+word+shortcut+keys+mcqs+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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 11012 bytes
SHA-256: dd6d30384274de1ec64d2426cc9ce288031322bf414490e0675e6a1c982f281e
font_01_sfnt_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 17184 bytes
SHA-256: 606a9df10be69c14abe3258629fd2a7ce865361d0dd20c3eca45d7d7b4794c2c
font_02_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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