Malicious PDF — malware analysis report

Static analysis result for SHA-256 515d2d1c487d9b44…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 03:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d9935660b42565c127dc00f2d130f3c SHA-1: a04ab5fed091e352af6f6aa842d9f761a057cf28 SHA-256: 515d2d1c487d9b44fcb655d63be8a142334cc381fb132274a1da57002e191840
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier strongly indicates malicious intent.

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://philabc.ru/uplcv?utm_term=minimum+dissolved+oxygen+for+aquatic+life+in+ppm PDF link annotation
    • http://nebovsem.ru/app/webroot/files/files/lugix.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/mimipusimidaz.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/21640097677.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/nizilawum.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a94505c7de8---42838347679.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/pamam.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1545f2b895---lalebodovariv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a1295990e---xazapotokaf.pdfIn PDF document text
    • http://dalaichau.com/files/73682872644.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kvrdcquevuch04b8ljli50jeob/61669593556.pdfIn PDF document text
    • http://pvvc.cz/files/bopisivo.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/puzuputiwifezolijexaru.pdfIn PDF document text
    • http://juha.be/_files/file/xumozofuxulafaj.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079be8d698ea---tanuzumil.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/tulunerofudovixufan.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/samuxawigalodeperamejosos.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/89b227985e9667a0b8095969ce3e4936/78395781920.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/xujedagivoxizogod.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/noborisovujiwinel.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ee4ce5031639a23960b7f202dbb272ed/28297662413.pdfIn PDF document text
    • http://harlit.com/upfiles/file/miwufopelinebubel.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/89855541561.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8bb8444a---49473788317.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/lapek.pdfIn PDF document text
    • https://irantruck.ir/data/file/jowagaxi.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_off0000b895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB895 11484 bytes
SHA-256: 57884a5d19415fd084d2e1f74657b44fbcf2e329509822eb0ea26bd89d2f0d12
font_01_sfnt_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 15332 bytes
SHA-256: dc16f07370eb16afc454033e3ce4aa3e266ed5d89d5092ba7d53086e0b2627d9
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.