Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a5a3ffac12b1fe…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 20:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5b0f6485430dabede8fe47f6c9ba760 SHA-1: 6eeb4f6076c344cc69e9db6ee90f90e293f006d6 SHA-256: 45a5a3ffac12b1fef77114fa1cc5f603c368ce09c39e9178107a6f42a8a0f7ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload directories. These links likely serve as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4d538955---nevozajuxi.pdf In PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jgfv8orpajb6iqcp9tvfdkooh2/50725312188.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f096513297e8f7ff2a3403c66681176/6676960231.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c238c18b383---40861642191.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8649e68f16---kekakekowuferaxaxa.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/22420597746.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/99488345415.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/waxugipigorudifesa.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/78034008629.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7d3b39bd---8886664694.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/32796644443.pdfIn PDF document text
    • https://loyd.rs/images/file/18098060955.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/d96985a99ec0e162fa1e4d83f6cd8c70/fanuwetemaxo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/80867d4a07e357e896eb14a6e89f8f72/20558812302.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160944a3935357---tobugumupixofe.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/37353786274.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/23500536088.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5b84f815---bukekode.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210804221710.pdfIn PDF document text
    • http://erex.hu/upload/file/ridefekajanijefufilukegu.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/puguvisokebo.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/46151174445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lg+inverter+linear+fridge+freezer+instructionsPDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17088 bytes
SHA-256: 789a109ff9554261ba789f609049ce2053e15f7943f5918ccc713516585d3522
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 10832 bytes
SHA-256: c93af6d15d47e14230cd31296f91fb11694c6d152c755a1d7957699730f052f0

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