Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4c67d73c4d6c1e…

MALICIOUS

PDF

89.9 KB Created: 2021-09-08 08:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7fef6906097b2381e125270587ff03b0 SHA-1: 76c9a8d8e1d9c7bc417919d1d68b7b459f4960c2 SHA-256: 3b4c67d73c4d6c1e9720ecbb7d0bc2e3b64387f443d3da88a52c8ca431aee4b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e187e979---wamoganixomu.pdf In PDF document text
    • http://dkkarsin.pl/img/upload/files/larezifekofijuviwugoj.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca77d1b58d---36831720908.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e8fe63a19---sijukiwobol.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/gagepukazuliv.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/vibinif.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3d5138ec40819b3ed6f5a9ab8d5d1dbd/jutuzasuwonipawaluw.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/96790091607.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/85739889255.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210705220805079754s46vd9.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160879e8775bcf---1065728749.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112da30d187d---19891827382.pdfIn PDF document text
    • http://thaide.org/userfiles/file/risivixede.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/dinamev.pdfIn PDF document text
    • https://proxus.nl/file/10278251630.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/87429283175.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/38847445253.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/daxinak.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/larexezesikepelapid.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/3593911452.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/fugozizetuxuk.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/04828bc86a98cc0493936b10024f3ce4/66812802348.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/22885240654.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9d3f476a2---zikexoxelakezegaruravurus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=uu+pph+26+pdfPDF 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_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 17944 bytes
SHA-256: f378d57173f0059b4042b7e40b2193801cca300486c5d40df29d164622e73641
font_02_sfnt_off0001448b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448B 9968 bytes
SHA-256: cc2a1ba3146153769054b8d9a933c962a93b337a7736f9cffea7a0f625cb7182

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