Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22b5b9017407124…

MALICIOUS

PDF

88.7 KB Created: 2021-07-24 17:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d043535920280e7edaf19c47605a6434 SHA-1: 1589833d8e71d2a0ddd025e4effa36442ba889c1 SHA-256: f22b5b90174071243085f40c9919cb1d5c1090bf11462e16ec35a72d3c5828e3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8uqlbbjgbpkmsnn6osd2c3gpuc/rikeratapilajotuwi.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/60a00b131580e048c9e1df5226b98c65/84286717748.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8688cb1d---bifesiwededorofijawofo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/67639592395.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5b2b4138bce07582d575e8b0b6ef947a/26108664512.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcfdb1884b---6806855100.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf02c81ae8---71350972261.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/72717575743.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3mgtg664suknnco6p1hh7armk6/26676623846.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609662f51faf6---xemafawikerisoxedifeguke.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/3137970721.pdfIn PDF document text
    • http://stroi-sistema.ru/img/22986812180.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/dc1d5a56a8c1a19b2a1af7b43be9a194/81065566389.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d11212e4ab454c6fee3e1f2a49a23d8b/97994928488.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///57812539625.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ui3420rnj4s3mo5jj6vppo6cjp/55663055173.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/21961196533.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/40673602179.pdfIn PDF document text
    • https://ebooksweb.net/files/file/pitepovirikerelinivonuj.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607589096acc0---sivoluzopomonuwejerifatu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/papivitofibono.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a27ff96e93108556289e6b3e9c50bf9/79911118595.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2c7f912ac9d82ce4ea3f675085191c90/loretagem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solving+literal+equations+worksheet+carving+pumpkins+answer+keyPDF 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_off0000f0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 11500 bytes
SHA-256: 7980bc6db3f4b6ce688c6da0f37e1d56beb13f14d5349ae35735c4df4fa4a59f
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 18000 bytes
SHA-256: c0ce1923f82a90a3e362c46da70553020cc24df1d6d1306585c273cc75213677