Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a827a7682ccf3f4…

MALICIOUS

PDF

93.5 KB Created: 2021-09-03 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 41d5ea39209904ca12d7977d94a50e98 SHA-1: c88a487d592da189be02138078ff3019ac152490 SHA-256: 7a827a7682ccf3f4f7ec85ce71d83d3a50c07c53e5ce6a7e42954111f068a9cd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sofia-es.tokyo/yamituki-n/uploads/files/luniz.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611b51fa8e499---58132315614.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/21dd7a12bcab9c0dfaa4004bd18eb736/96334340749.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/vumebikunawanazatu.pdfIn PDF document text
    • https://digireg.nu/upload/71148478267.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079bc5a6599b---54112723305.pdfIn PDF document text
    • https://digireg.org/upload/rizupokilidoxibebigufo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/99096664529.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/wowadakefogu.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/mebibevefajulezesajaz.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/16623627659.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129875337301---fojipotenoverikabotu.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/21541203315.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783dafc52d6---sojaru.pdfIn PDF document text
    • http://kotolantopeni.cz/file/53153523396.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf895e5db17---dulonog.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vkdsnih99ogtd3craq7vhouo88/11644300798.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vb9v7rsu82mvihgnlnu5fjjun9/rewarimonemupikosid.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/getepabilikawaz.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/73655365316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mooring+equipment+guidelines+pdf+freePDF 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_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 18216 bytes
SHA-256: cabd21b9ab8c2d0eeb68a09e52fa0b3391c76068c3229dd463295f214d8da8e6
font_01_sfnt_off000137a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 10920 bytes
SHA-256: 8da2d815b2ffe8cbe9761bf5d7e20f7f8763a985d899c47210e7a20beec820e8
font_02_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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