Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dad362e4c226b4…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 14:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64a4b963fef94d1460979ad4fdf56cd6 SHA-1: a4aba341aaf5ebc4e7e2195cbba248556a34218d SHA-256: 52dad362e4c226b4044810f2fe7caf7dae4495b10a6174035b85a6c895eba662
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to redirect users, potentially to malicious content or for SEO manipulation. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://alice-immo.com/userfiles/file/malutitexe.pdf In PDF document text
    • http://ekotop.eu/userfiles/file/82363578602.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9847bdb7---83305017273.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b363d3342---sararovuzivero.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/nawafexewiveravivu.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kixefuvexojalenobanomu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694f32b4c1---43198788991.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/83766159197.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16098310534fb2---69271556319.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/firirilozepifezumunufunax.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8559fa82f42048622b31caec270b910/relifunumewomapaxegemuje.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/vinejuvedi.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/22112071631.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1d57bc5dc54fb1a04e99dd4ead528fe7/83572303999.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fe33a79ab---gufevurigat.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/78d6b7cb78c7b99e2fc41e9c1fd92245/54784840804.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/oo0u8rp26vrfnvo6cr2tt5ru07/zokizerobeme.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a946e1277---90216312235.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/63692230451.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a8869f89---lunodafo.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/gamogove.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/68168329969.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/tabidi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73104884667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+are+sex+influenced+genesPDF 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_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 17752 bytes
SHA-256: 147a86a9599e2f53c7f342c634d88e1b16d59e3c7ebdb2b99adc4ef7e3d57f27
font_01_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 10832 bytes
SHA-256: 7f554c9818647d83a9d4440c67b11b7b7678ac6a3aa2468ea42864a9b4e0f8fe
font_02_sfnt_off0001449e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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