Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3383a03084f8d57…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 18:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 56f94eb843c06355c6babc51f1f29ab6 SHA-1: 2fa57107216970c7ee1a510b22d1261144fd3ea6 SHA-256: f3383a03084f8d572a5b2a1c40611401d31c68f3195150af292ca22c41f17043
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nomylo.ru/uplcv?utm_term=subchorionic+bleed+symptoms PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/26858923370.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98086b93c8---votodowenagarepalatura.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c78b9e11---7002894035.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/in3mh92t8hdao5pdqdrov1r8m7/nofanobirex.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77fd6bee---62793442138.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r9o1dfov03bgp3of580hqhpde0/misadinajizefavamuwiduw.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/tawejomezuluw.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607849741d87d---20111246533.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/acmh1b7nro5quolv3p0i72871d/98550637004.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3c4afe659e7c3e86f66e039f9569abf6/20521010629.pdfIn PDF document text
    • https://t2sc.me/userfiles/32708678701.pdfIn PDF document text
    • http://veivel.com/userfiles/file/wavafalukufetomawubi.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/rojer.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/98475511457.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/lubuwezujelife.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dofipelagepovesajese.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/80728999740.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdd2afb59---wuvumotifadawogajetex.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/df6b1fee10c0adc224135704cff684f7/vigovibezon.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/jenibivesotareru.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/d3nfes6k38jp1hrv5gf1itm70k/xekosise.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/wezakuwufedapuwox.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b4172121798---gajigase.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16812 bytes
SHA-256: 9d08a06f992cd4beb76565f8fece5680b4fdf6dc14bf7b5298893dc1ca45f753
font_02_sfnt_off000133c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 11044 bytes
SHA-256: 2adb08d8eee3328fb8b4b3cda09dc53edb9a98898c2740041d24ac6ff6dceb77