Malicious PDF — malware analysis report

Static analysis result for SHA-256 378235378445ca35…

MALICIOUS

PDF

136.8 KB Created: 2021-06-26 06:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fffce060a40dea2e2742bf3e06c875a5 SHA-1: e80f190149e26f4aa499728c34b5ca6541cc8b1a SHA-256: 378235378445ca35e36a24530214ffcaf6775a7c49bc6f37a4bb7a342fcbe66b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by directing them to external, untrusted resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bldc9tf69lhp37mf6rlvr40j26/25927167014.pdf In PDF document text
    • https://air-separation-supplier.com/d/files/nivapusasasolel.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d3b383914e167140bccd7a2f1afb99e3/rotak.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/37812703269.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tenusijimowedelez.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/oe1pgivgp6psnkm0fm19dkk131/62757738370.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/74118608375.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/sovotuxudirurojumofifa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080654907c7c---kuburotopotepimufe.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/mafiwomu.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/39890451016.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zurugobutawipovipi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc2173ff45---17918652868.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082911cb7275---kejowavigojuvofokijixabik.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucqs6mipq1a5t645tdspta0f9f/karegiteriwolorajaze.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ccfd39bb---76310262073.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/6100070645.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/guvenifanisufe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da1c92bd6---30322448237.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/35927272300.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/67365474695.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/66778362335.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/16962665977.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a37a53b39cf36e690b8a84a0e36d1075/buzogosofunabafinopogalud.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8978d4a7c5---64209329952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=opening+pdfs+in+wordPDF 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://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_off0001b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B649 10480 bytes
SHA-256: 113a92522de064999745624d8ad3b9d9c1e079fc46b29b74cefe17193ec971d3
font_01_sfnt_off0001ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE0B 17656 bytes
SHA-256: 9d02ce93f37f81d9d5e1fdcf14afbc11d3cd2e1ed3f5e2c2de28a2c092169876
font_02_sfnt_off0001fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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