Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e73f59a96c084af…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 23:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db3bccfd17db5689efd9e287b7b0f2ad SHA-1: 5c922872fa75ef1b405dd8ebc8f57d002b4b8f80 SHA-256: 3e73f59a96c084afbd8cdbec3809719b3ca91ffc470994f19f8a622950b9fb85
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to malicious or phishing content. No scripts were extracted, limiting further analysis of direct execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://cuatro-pr.org/sites/default/files/file/saloxipubolu.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161233c5421f74---nivebututalepuna.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/jasikexakalipusogov.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b0b3df50e3b6bd5cd40854926d04c23f/nafamivofugukatuva.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602db2dc0f---78722121968.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/da9d7afc0c3ced15c27297981d053144/jemebimojub.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xujixelediza.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/299a0f36f476f7eb05c5916795f15749/jekabibimebiwipujom.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/41489331341.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c96352bdd11---46126470293.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/tamese.pdfIn PDF document text
    • https://ghnservizi.com/file/vizojipasazateb.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/33116b7a818fa20155c999a01b903cf3/93832745394.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/52128445037.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/23704062448.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/koxilipivobidu.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/wurum.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/novil.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210622_1A5581F9912E628B.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/98485782757.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/92487497522.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/99989038715.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/61534367328.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-19/20210819044409954386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=rounding+to+nearest+10+and+hundred+worksheetPDF 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_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 17244 bytes
SHA-256: 929147e0426f4ba46b0f08ce511cdd423ea06f1b010e8f6f466dd3172d54093c
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 10976 bytes
SHA-256: 1bd102668014d709cf23a0a6741d08aab6b1ad4879fd6052b3ff138baa043175
font_02_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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