Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba7f8b10fca703a…

MALICIOUS

PDF

88.8 KB Created: 2021-08-24 23:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0e743fb5082ba443106568fa7b02975 SHA-1: 8c28f2ca253cef22f5421d1e0d6a606866432b70 SHA-256: eba7f8b10fca703a7ca3f13757874194ea415ea22a9a35f731b3f7c5cc826767
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads or hosted on disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of numerous external links indicates a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=computer+graphics+notes+for+diploma+pdf PDF link annotation
    • https://cissud.com/uploads/ck_editor/files/36043106611.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/14413562611.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/62118262593.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/80659492259.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a296db156a5e233e98336328643b89ad/sajupen.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/22550671252.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b12b5f1119514db6d05b589bfc0d0fcd/gefebejoxabiwikuzo.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/35509608404.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094d698ce8c1---zatevagulajusofasetoze.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/fipaf.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/478985e6558aecd803d768535d439d2c/japesegu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7h7j6qt4876cibbon14kt8bu31/gekoloxamozebebupalum.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607150a2898ad---sepabitagupure.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb7ad6a58---73695608804.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/dfc6761296642366c1d40f83a5fb4036/82536739433.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/3514755572.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/dc1c1286920f4f045f5e281e7d52ebf4/mogizu.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/69221221884.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1c0505cd7fd0e4c65fe79bc317c7d5c3/doluwugewetejefiraxu.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/8478721759.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/2998183370.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/wedikobi.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/toriju.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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 11200 bytes
SHA-256: 95e24231d4f795868f58f79aa3a5de81274808018045c60de7e9fd1acfa3ad5a
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 17320 bytes
SHA-256: d6ff6c1657d5e3683ae1068fc89c8f8f6037dc34f8545c0f5b3357f57781958a
font_02_sfnt_off00013ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1