Malicious PDF — malware analysis report

Static analysis result for SHA-256 334d6bc62fb152e3…

MALICIOUS

PDF

80.6 KB Created: 2021-07-01 23:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fabbf411f27af2441cad747a09349d9 SHA-1: 3e5c2a84ccbaa1ddce8fda6aed989f2ad676658c SHA-256: 334d6bc62fb152e3c8bc10e31422d27ec50b47506a8b3da39bf0225f4683a4f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/18c858fb40037ba5780d63e33c4535a6/67302129445.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/157048775160ce12d2bbf17.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/72247751076.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61ef7c7ab6a63d666f1e7526db499964/71494855881.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075692438dba---21969389007.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a161f0c12fc---63547100032.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/75201355668.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cf9682ac001b892a2c7be5ec1f385d4d/63250214149.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1khsj739urklilfg5eg7ap6cf5/97530623143.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ski6halmn6gk9a8rab2nuq60q3/vopuginafajol.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b494675e83f---debemulununepugosenazuzaz.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/71844485928.pdfIn PDF document text
    • https://aspirans.com/files/file/73070553677.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077adab72855---39876569724.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sizabapamarifajomotarom.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vededetamisugav.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1544b3aff---97456620115.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wodotimidurexexebepitadij.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b10062944f0988639daa06c41b828050/nafoxozatumomomagi.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/bozenamuguzudumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=77+faraday+to+celsiusPDF 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_off0000cdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF9 10532 bytes
SHA-256: 9695fb23376737275a74a3b593621ee8b2c225838d08d4324d2be8739ca969e1
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 1848 bytes
SHA-256: 182928a46bdb49b7557838c6621f3dc56f59d22080ffb280d0a5c9038a50f92c
font_02_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 18052 bytes
SHA-256: 52baa6836d8921ecc5d2e498fb48a555b9adae62bc5e1e90c37b1f3a512d531a
font_03_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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