Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672db62c18875b8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 14:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35e43981bee8a7095a5477f28c91d712 SHA-1: 8699fa27749335098ba724454b794884a46f5037 SHA-256: 7672db62c18875b836d0db0be9cd2a328f67d8ed6251e581352e5cd4d0f2bc4f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to various external sites, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings suggest a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.americaninvest.net/upls/files/tokovowamarumupodubi.pdf In PDF document text
    • http://apsara.ru/userfiles/file/siborazesadipunetabefuli.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c53e4b2b9---vepekar.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6k9nt8cb5uebkj6fv1qgifl3b7/tupeberuvix.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gazamigox.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f0baca14f695fec47a6a748e3a7711c1/64657230546.pdfIn PDF document text
    • http://staropolski.net/Upload/file/38732726646.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5f01hgo4ov5pitgl0qb4jnrbg1/19837535385.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/14606707705.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470d685d16---77104174033.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/sebizikolilenolumojuranew.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/68704909630.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/24677338026.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a635e0c49---55042989949.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vatobet.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210725_E1AA03494191CFED.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a972d84ed4969565f2fd116e77682b5d/43044210871.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/posiwewifutovuzukonerawok.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fizakinigifitugelapep.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/23162525416.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/rakatedufuletuv.pdfIn PDF document text
    • http://cascad-trans.ru/files/voritetoteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=biotina+alopecia+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_off0000bd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD12 10400 bytes
SHA-256: 7eb80e62063f24cb1bc6039f7dd0da252f0cddd0f146d02cf1f273d049cecd83
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 15312 bytes
SHA-256: 6e02bbf98b7bf734bc407074c81fe8ff84607900434e4f47c7d3fbc15cd2f172
font_02_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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