Malicious PDF — malware analysis report

Static analysis result for SHA-256 89564631cf59cc82…

MALICIOUS

PDF

108.7 KB Created: 2021-06-27 04:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c25e12a025ab8bc1c3f86ee66e9f96b8 SHA-1: 1e4f3d883d8230271186c3f2c21e66fc42208e43 SHA-256: 89564631cf59cc8205e2d197bc18535431fe4889dc887568121b500dedb64c8f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/518737h7j4bfbd5b6rk6fj1090/6792608709.pdf In PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gakepi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/6109103989.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ec2222f6---76342495308.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/babasuneveruvosolemewere.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/mufisulejijazore.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a1dd6cc34---39490796408.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce869e6f0d---zavuzex.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dee8715ea---fuxelusupur.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/22960515731.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/61763347292.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/55211123598.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609827e060b2d---87673921993.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d58e7e818---80651654786.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030423179931.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20beaa73f---sekalelazifaf.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5373cb2f3d---39803192501.pdfIn PDF document text
    • http://normel.org/files/upload/file/71975873806.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/66836815984.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zogilepewodododog.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/24d3decec2165537846e879d911236db/16851595502.pdfIn PDF document text
    • http://hotstamping.pl/files/file/zeguvevimaxivizafini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=corporate+excise+form+355sPDF 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_off00014329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 10928 bytes
SHA-256: 543d225f4ef96ac7aebf93c43d4d864602bfaf938db13f228fc0c1983a443997
font_01_sfnt_off00015c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9C 17992 bytes
SHA-256: ddfde50a3acc5cfab5c1491d847d162f7bc059c1c69d1c1be51a4650168af618
font_02_sfnt_off00018c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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