Malicious PDF — malware analysis report

Static analysis result for SHA-256 8616b45e0121b881…

MALICIOUS

PDF

82.4 KB Created: 2021-05-06 05:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 65587ccc968fa708b1d50adce4fa2c0f SHA-1: 511fdb7a0037186a01ee4bcb149405a6a551d4ce SHA-256: 8616b45e0121b8811f8557eaf52dad60a2d3af8df14768d4d5f6018494acd7c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f053414ff9---gabejiwojukedowarodorago.pdf In PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/e531025539fe00d90dc1dec10acdbea5/najipebetidimiju.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855c7d72d6f---kibafinolekimutemixeb.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/86291176425.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/06u7hr6nbc3ui2emgpsafppcl9/mazatazelusotumoxisugeg.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tdtf326sg4u5n18kdcbeue386m/xukagoka.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b86dce3c07884f5d641f79ee9e314fa3/nuseg.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4e722fab---niforumotoxipaboxixuwage.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/1f7565f48bb653c9e26416f53d7066c9/manuripelilo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2797a8e28---99414346003.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/dtk2aogj61jtcp6jcjb9aips2h/rapivapus.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160931dfdbf5df---28361956616.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609059ae577c0---27203320865.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3492db1e---misududukifuwevon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bus+conductor+online+form+delhiPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5100 bytes
SHA-256: 284ba11f1ca370b202f0c041b9048cb75e82fa5a901e56c29af0efb02a5e3769
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 11036 bytes
SHA-256: 8bd708784e977cad77acaaa199198141f752f791ab9146e34cd1142696bf5fdf
font_02_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 11628 bytes
SHA-256: 77721dd537427b764f7bd89b591658b09b6f800bdd418ddf8b783673fca737cd