Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b560fa1df779634…

MALICIOUS

PDF

98.4 KB Created: 2021-09-16 20:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72c0cd3ac3bfb94ee2437e79acdf2216 SHA-1: 35789abea4cd086371514a58f2eff31a0196075b SHA-256: 9b560fa1df7796344759e8da3131c618a8659b31a0e3d729ccad1d49b5e19571
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external PDF files, many of which are hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking links and downloading further content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=the+curse+of+la+llorona+gomovies PDF link annotation
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/fenogez.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/61869935181.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/dexinetagabufajogati.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/gosibosivuraz.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/24398170149.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/17371758568.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/65155448840.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/dazej.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210901183450.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xalemubulafovip.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8807fdd869086c3df7617664127d508d/15388835278.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/35482971512.pdfIn PDF document text
    • http://warehousetraining.ie/images/saredarumebasedexuwe.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/71127065250.pdfIn PDF document text
    • http://poorclarescork.ie/images/xabaxorupip.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/228c6ced6ca355de829b9f19f24312ed/radozom.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/58373566630.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/seribudolosatawa.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/begakegami.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7648549a335bec32ae14567fb0178bb5/9100281109.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/dibejibuvod.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/toponufukaj.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32ff5a423---bomekuwusav.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/xuzarozoda.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_off000116ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 10816 bytes
SHA-256: 895d5e4aaf62f9bb7a4efd0d78e20555d08017e3fb0ea2f0a18984e9dbe4def1
font_01_sfnt_off00012fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C5 19836 bytes
SHA-256: 2fb0400608579b327bfdbce3ada39d6e129bc15eeaa4c2f97e5c2e3b0516eab4

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