Malicious PDF — malware analysis report

Static analysis result for SHA-256 9100b03921b25ff0…

MALICIOUS

PDF

85.9 KB Created: 2021-08-13 22:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fcb118631df24f33c3c21212a667c86 SHA-1: dae9d92db5036363a70331fd313a9bdf739a5689 SHA-256: 9100b03921b25ff09b57e6ddec8f19140452d1604a38844e27f33a275caa40c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The primary purpose appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=parts+of+the+body+vocabulary+exercises+islcollective PDF link annotation
    • http://yfatc.com/userfiles/file/nirapotarado.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a8b06ad76930177506ebd5deead08c0a/41375092964.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac23ab88eaf---30102229449.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161038226344b8---xenudonikogavez.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/28087b45a6802dbc4dda020260243302/60928989167.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd32581da7---60713139739.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0d6cf1dafd07d35133d07fee4d101567/26421950821.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/vibipo.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/69869634455.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/dd4a96d847ef46a0b04c66dd4e0ac5d9/zofidalogowikile.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/11125944851.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8c1ccp9jmsnhlbuv8hqsliahjc/vidobovekemefumofej.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c552dca---98503231648.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/60370177601.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/jedawisijirarun.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d3f9d6ce265b5d4777907d8a44b40cbb/17822266386.pdfIn PDF document text
    • http://jarosi.hu/files/file/12810646428.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/98467197719.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/86919132548.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c48a9770---povavudesuruleruwinukuno.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/16753959176.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/loniv.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/19265093251.pdfIn PDF document text
    • 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10992 bytes
SHA-256: 2a0a09eba202764565b817b0fc3222ae62505f11dd097a809bd0b390d611b914
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16616 bytes
SHA-256: 03ea00698b82e38358723febdec0cf9be5630dec7c9aa6541f5b1610be83df69
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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