Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b20bc36f5a7a17…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 23:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f112168461f2af2670193c07fb803295 SHA-1: 98709ba89dd7790429c17c62f11cc58adaa0560a SHA-256: 93b20bc36f5a7a17ad6a193976d795bc14825e2c71e9210f873b31e025191383
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and embedded links are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=how+to+cast+using+mi+tv+stick PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc10b39fa---belejijoxidemaka.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/65550098759.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/52413055076.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161312a64d4d1f---75787592176.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/4090378286.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/pikabe.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/70375939403.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/99029358863.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/zojofefokok.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/61782827988.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/93864054674.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/32879851713.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/babatagiwosakewa.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/13482942451.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/sinasakipidamulogakali.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161355a94db01f---zifijodokemedumimegoke.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/64517521460.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/zutufejorivo.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/safoja.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/34138886494.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/rarokutoruxaz.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/soruvenejibi.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/39410052020.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/powenefeduzozawet.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_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 18668 bytes
SHA-256: 1b29db57be64d330d72cd9f60474902fd535067b04faceb6beca03d7338da5a9
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10632 bytes
SHA-256: c0a2c686f00b1f7b1c20ef3de041528d9e14bd90477c0b420cec582b7c47079d
font_02_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1