Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ee0b0757950c6c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 07:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 987540d2d9ad4ea70f1197aff52aed4f SHA-1: 870b04cfd1ca6df591e75ecf072cc2a196e1aef2 SHA-256: 58ee0b0757950c6c758da40b7e1f2b559404ff40d32e95fd5410f85ac9c24503
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs and a 'download button' heuristic further support this. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nyig.com/files/file/20176793766.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xateku.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/81773430919.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613344dd18b9c---62178962173.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jinopadegujagadiwewemanil.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/zilipijot.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/vawogotuganalesubadonise.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/sezenukeluvonaw.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tuzunanibuwizofefujesule.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fobunikanugif.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/24586305380.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/36620430276.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f788835d26---6023323186.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ededbd0cc---meluvutamobesoz.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/peloxemosilavevux.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/viresomefebogod.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/jemuxowemoj.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/12491912952.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/28963203728.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/babonepuworonux.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/35727170662.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613510a422ceb---88955042353.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/480enhppj8d2ke59prku89h1p6/19118723937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=flutter+file+managerPDF 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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 10348 bytes
SHA-256: 40705b3771299e5a2b89d232413ffa447215eccc9fdcead9b94a2d3babd160ca
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 18744 bytes
SHA-256: b790b0fbec495a6263edf49474b3bdbabc3e57359ebc01e231d9389e3def07e0

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