Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e3638a06aceaf…

MALICIOUS

PDF

81.5 KB Created: 2021-08-31 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c71835187cacfaa2d02c0945b5666d2 SHA-1: cc3ee3619563359a9fd2e07fdc4579f41ee03089 SHA-256: 4b8e3638a06aceaf474f0036f9d19fea9b4aff7dc68f525efa35162214e3376a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, and the structure is consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac7f9af527---vitemumovedabimu.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160977b1d38b9b---68170973250.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/09ufrorkmbb6n1bf8praphdkje/57462406791.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7fc6f45c9bfde6db40d06a73b64f9889/lavuzosijutenu.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fuwiluxijenakojamemo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/84168238369.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/28098224783.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e415391bc3c40b1b0e23e632a52873e6/wovovobupuzo.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06975da817---lusowivis.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vadixesawopuju.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/womeganerawogoz.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/xatojebixirefe.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928d737764e---buferefipukajez.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/74055620209.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/mifojulotapinadimuvav.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160982fa2ca6b6---sezujig.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/guzefexatoja.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5feacb44---fetisikiduvolabu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611819fb8dfd5---74731076720.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-6/20210506154839315919.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4drot2iqh6t0lijqpgnphhpd05/gevidasoligeta.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/83797143578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lumen+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 10292 bytes
SHA-256: 3754af2f9880faa77b269976fa3e4e41d62f5a6efa9e9d366afe48c8c613ea4c
font_02_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 16220 bytes
SHA-256: 27be6dad13d8a6341d10947f3f98b0df1170d7caa749147ed953695dcdaaaed9
font_03_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 20284 bytes
SHA-256: ba23d854321324c7bd7ff415d94c6e26e17f446918dcf0889cf5db08018def9c

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