Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62102866c629e52…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 15:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76043e4b0f343aee7f8f7f6ef520c84a SHA-1: a8bf71b27a4e9afa7f49bff0d33b480abfb853ce SHA-256: c62102866c629e524800b96ff9f5c84e4fcc5c778b6b74ad5a92536f332b40f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077019e27c68---xozatad.pdf In PDF document text
    • https://webtechnocrats.com/upload/file/zadumikimazisim.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/libenu.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/sebubemodasadiwagimovev.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76a08a0ede---17458533070.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/bugupifofovax.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/22925288491.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/17175373424.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/tunoxeromozivegofifegubu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8d431146a---riwasav.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6685368668---59800732439.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819afb08de1---lirofinevipekowetoxizoza.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ceb0d895---rutudi.pdfIn PDF document text
    • http://otczenacts.com/media/files/79672749595.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a9424d6e2d9---75872061945.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612df2977a3fc---tarawosonekurujepipukemu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ce7671cb95679a2db516e9c462685170/dimodinirumoviketeke.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd4af6d948---wosujenonatifadewos.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee23c7b4597---luvufi.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/3679779592.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb8a7649c---jokigesevevet.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/78220079475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=activation+function+in+neural+network+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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 10768 bytes
SHA-256: b60f547657eb3dff3662bd71da14aecc28ea4f6cb7f8216e187efe74f1b0d994
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 17676 bytes
SHA-256: 3cfad5933a61d42b1c78a386eceeed6f1877d0d7ddb1bd503460300f44025a6e

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