Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f910c7c487ab918…

MALICIOUS

PDF

82.7 KB Created: 2021-07-09 20:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7e740e048783175352aef7441d277a56 SHA-1: ad745afaf5caa26fa52295bee051f1b86c20e925 SHA-256: 2f910c7c487ab9184b01fade3b43b047b7ad401ec461926bc1c97e40a57d2b8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a989b9e8cf23d00e495d127915174489/kewogiro.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210621_d8b68.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ad8621e72290f1f013c62e6c9b2ae4e0/fosetebarizopobaxudu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nl9hf4m3p0k0k14674htpspnf8/sabetol.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4103475af8---12527603360.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/tevelaporufukedif.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ffc7074c3acb6bb023dec3f557a556ed/baxijimefijezazesavudi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/67980810035.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbg3n7ahsc2uo9clvrlo17fene/57285608400.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kibifigej.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/o6dt8u81lt4eelamtlsi7nn6vo/87517769778.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/77924438689.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9e02461c249ec62825417a4d2bb7bdfe/44797583020.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0ea059a2---94840699077.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/72366ad254b219a1cfa133f1f657e1fd/95643643033.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/836464661c50f5e2c16d816d35d22a89/tigudifubutumujanorolape.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7b50c04063b5dc13456fc78c84c26286/lapopupevi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cqkia354hsu2mvnio17e84281/kugesobe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27516ec3c---63356290947.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rorefekugaje.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/vaxelesifajirilu.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jimovaxodapalutaxevotemo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709de0cca18---rusomuvawufifavotiwixitaj.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0bb448daf---69024091626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=forced+circulation+cooling+systemPDF 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 10904 bytes
SHA-256: 0021b75b030c7d0234f2f68c49211e2e1736ab4db06583c80642bdfe4c884fbc
font_02_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 17000 bytes
SHA-256: 4c99fc8ea69bd8780206b8e3a849a3eab10d3fc8a1527e56ea65641432096af2