Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6445637289d8aa…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 01:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b5b92b2b7247439ac75d864a3ca6581 SHA-1: 7d75ced362a1d6f44378319e1c1fb64c6d5521dc SHA-256: 8d6445637289d8aa078527d8f0cd5b84f26bc10d7b584a8f2ff2df948a665ce3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. The presence of embedded JavaScript, flagged by heuristics, indicates potential for malicious scripting execution within the PDF. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://pistant.ru/uplcv?utm_term=icebreaker+questions+for+youth+pdf PDF link annotation
    • http://centromedicoveterinarioadda.com/userfiles/files/13241151125.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pusunedemenetajam.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/27109937824.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fb029f1a394d33d5f85f35dfd6440532/jefukebitifuwarir.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d4c371b24---83044680196.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/karanopomefidomokudo.pdfIn PDF document text
    • https://areicon.com/images/file/94762199244.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/98162222274.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/wigefejinanuvesikajibab.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/73966373631.pdfIn PDF document text
    • https://camphacement.vn/upload/files/75968248203.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25bc1047d3---wexulajekawifodolerafem.pdfIn PDF document text
    • http://charivne.info/images/file/pevirumakalodavuluwor.pdfIn PDF document text
    • http://aven.su/userfiles/file/bokizorigepoxazotijisetu.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/wezabegitesawejumil.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d248f625e3---71994233396.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609430bb7c0f2---dubowikukalukufofikulule.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/9641832842.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/62156575591.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/wizadudinasagazugo.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c36e0508910---90823388828.pdfIn PDF document text
    • http://travellerisland.com/files/16088090612.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/retoxobul.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/44243109571.pdfIn PDF document text
    • 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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 16948 bytes
SHA-256: d97d24f274b9d22770b92fa06ef7743005f9bf1d6a0e14de6faf50b4a8cdf393
font_01_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 11212 bytes
SHA-256: 524bdb91ab30ec5f91d085003c664baa7948b595dde3b8d1c0e4220b9bc6f767
font_02_sfnt_off00011f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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