Malicious PDF — malware analysis report

Static analysis result for SHA-256 108d65dbc7aa4e6c…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 03:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ce3b9111261ad31a1c6a8029cd95e3c0 SHA-1: 2cb3874b36f7f72cb86bcba21a21a628745fa3f6 SHA-256: 108d65dbc7aa4e6c11d9b23a6b0d12a8a2c13fd1abd68c191c1f32ff85ab5555
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites, and a heuristic indicates it's a link farm designed to trick users. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://philabc.ru/uplcv?utm_term=twins+mission+full+movie+mp4+download PDF link annotation
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0095e88a246081d2f660adf312a2b1dc/89931978921.pdfIn PDF document text
    • http://jngf.cn/files/file/lekodol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1b26cd11---wipud.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/26755024401.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc578a5c1---buranananogidegeserufofa.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/sazolemurepa.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a0653a2---fezosenabu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc31c7e683---80132210752.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4mne14p7eiik266mj0jdpjoklj/tokos.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/kuxurenenawop.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f053414ff9---gabejiwojukedowarodorago.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/cf0f3bbf5d84e4fc2b5c532cab55cdb4/pagojejowubimudisex.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jddl4raup0dg4ufbksp0gun18/nujunupegojulirevewe.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/93689ee613380be4cd9ff0b256c2d1a0/naxusaxujumabe.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/91809065598.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40c0e7edf---ziwalulamibitewaxaw.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/23a242328692996ed86d4e9094edd875/14838067764.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/47467362549.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9404a953f4---letojunex.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160859dee7d201---81369389151.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608693ef7de22---vojejonedijoxodeziz.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/37833003140.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gitosodoruzunewimoxabof.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_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10756 bytes
SHA-256: 3d4446fb287e05220cf019619ff80a0b4fcdd44b4469c82bf870ebbe9cc1edfa
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 17416 bytes
SHA-256: feb909cf293ce18b6f00e920c3df25af918da78f85e100313ea2306a56fdb8f9
font_02_sfnt_off00014568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1