Malicious PDF — malware analysis report

Static analysis result for SHA-256 e184258f5054d3f5…

MALICIOUS

PDF

81.7 KB Created: 2021-08-23 13:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9efed318d919ccfd4f76e861bd536ef4 SHA-1: 2555066f20ad59533278bcc1cfdbd638e4d950e6 SHA-256: e184258f5054d3f5819236ce43339460b11ea4213a9ff08c7689fbc7aa5eedf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs and links pointing to compromised WordPress uploads and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=400+baht+to+php PDF link annotation
    • http://redactron.com/userfiles/file/jodozolutadotatomu.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/56767674064.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/wixidojuret.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/98536296522.pdfIn PDF document text
    • https://ancoraeducacion.com/images/89506628937.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1761eda1ba---71611392609.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b667770432---lizoxunoxiv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/debd3f7cdd4a1234218fa00ae19282f4/17879485683.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/41187491997.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/52905090355.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/jidepunefovovopi.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/kumibelorox.pdfIn PDF document text
    • http://superpart.com/files/linul.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3120e1de---pozeweribivatami.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/dnibk848qjaffplnkmi381dnfp/zezipoz.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/tebipexogotidapegugiju.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/fapozitemiloni.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160943e4ad8728---pamuwulavododi.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a4ubl1i0tifsgk41sgm7omeikk/pasajugusujetejafupolopax.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/56377832947.pdfIn PDF document text
    • https://masukpt1.com/contents//files/82985971283.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0cd9010e8d8e8778cd5b186b3b510ac8/bujusafiza.pdfIn PDF document text
    • http://hzqzg.com/d/files/fanuxipomizenobepe.pdfIn PDF document text
    • https://fotovipvercelli.it/file/gidavamesem.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/bcaad4081c217c56752469d2fe76f559/13839852442.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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16720 bytes
SHA-256: 0eb50ffe2bac0ba7c51fb4f6750ca401a584e672874d85548d5954e5af59c7e8
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 9952 bytes
SHA-256: 24145b89d01ce724a84c59a734142cf6a2eae05d4e88baabf7aeaf69e0319482