Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f2bb93fa96027…

MALICIOUS

PDF

89.0 KB Created: 2021-07-25 00:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6e81254356f39bc9eac38d4ff9368d88 SHA-1: 305a611be473a7d28fe5a55c3bb26ec028988df9 SHA-256: c84f2bb93fa9602731c396d11276334eac45ddf8daa576477cf2ec6f9aac0ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to external, untrusted resources, consistent with phishing or SEO-based malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://massarentearchitettura.com/userfiles/files/55521943517.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/nakugusoba.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/sebeladisagulagisoweli.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/41100031506.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///lukibob.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/kumaxobofa.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/60d77eac401c2a7ec70c0228a0c71101/xunudo.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/69175045937.pdfIn PDF document text
    • http://ktcz.eu/files/files/17427623974.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16251724011323284686.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/85939642531.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/36252219097.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160775c4108a27---66323919334.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/migepeluvase.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/2e401793269c4f3d69ab0fa42c37b945/74503956564.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608679b5eb435---kapodezitevebusujadi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/50f2b14b06b09460e4659eb90d063d24/54389164872.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/sobesivu.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/lodixapedulajavipa.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/fiwirut.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukerubisesafogiz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3cfa3b70c---jakosupokifixelekebazobo.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/dezerag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=briggs+and+stratton+625+series+190cc+oil+capacityPDF 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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 11620 bytes
SHA-256: b6cf95c713e32bb450c0befb55840350fbd0d469033ebf3a0b8fe1f38c5a087d
font_01_sfnt_off00011158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 17016 bytes
SHA-256: 77b24ce97236a2687c66bffd8257ed55d894dd10bd50ecb4544d1978f2c7bee9

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