Malicious PDF — malware analysis report

Static analysis result for SHA-256 9967495be50953ab…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 02:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cd697308ce691544d10d2736bb50aaeb SHA-1: e44f8ce28dec66224642da9646cb73ba8506a326 SHA-256: 9967495be50953abeab05300eb7fc98be95f5d52a257e4940711aab1f07019f1
104 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of a 'download button' lure and the sheer volume of external links indicate an attempt to redirect the user to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=mega+win+slots+sabong+lucky+9 PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4c33300e---57695856595.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/wuzivitawe.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/garetivekatikewazomifuri.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/muviwa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/95951112514.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/xekametigopebokexupuvatib.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/xaxoxoxoremawig.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/jofazena.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/91231730914.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210907004318600.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a2163d0c9204eeb806a50b2c2182c43b/piwugugotuzezanumunuxepez.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9stl6k5s10n6l9qa6ncnuumjh/majeloma.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/62604823007.pdfIn PDF document text
    • https://mashura.co/userfiles/files/vekijelenudufiv.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/80308644127.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/87556687032.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3df1060---55433986036.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/31848220023.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/14800125146.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109111721284946.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a09ed45f3630555d7e8acf0a0e89a8b/lakufapadurafamokomefuwi.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/39166649126.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161371b98f3cfa---jagumebuba.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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 19628 bytes
SHA-256: 1e034218694c63d5a8a93b6c98c94c68c55b8d72add5870b8789f0eb51da7b4d
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 10996 bytes
SHA-256: 26e5c6adc5f0cc0f8f28bbabc11979858df8d407108c001fee62645c520120b4
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1