Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b74960f535dcab…

MALICIOUS

PDF

74.4 KB Created: 2021-07-05 14:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f3d25cbbbf9ff591b602c5772a86041a SHA-1: 271217775b20c6214e072fc9656c9839cf9216e1 SHA-256: d9b74960f535dcab84a9f1c826ac5abba31733eaa0989ccf303cad90b0fe4bd9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b938abb6b42057011ee0833ecab02544/72125841974.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4a176b4e2---88745729805.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9ac349052807bb592f44b8b8a576a6be/28421030241.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zotululukesofanusezukaxa.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/sakewube.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/36281e0c799f6de648b0725da17e90ab/vawovurupujezatoja.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/gikere.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160790382517ae---fiberebimi.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed8033881---wofedurajumev.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7bfaa1a6---filugov.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/27457877148.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/75363565660.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/adfef0faf231567da1a1fca0d028d00a/loxuba.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a1d6494d2---27838572761.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/soxupasadawaxatoguvorifo.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/9248461447.pdfIn PDF document text
    • http://chromatographvials.com/d/files/97148561010.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/galebi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cd505757---52560503378.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/34beb2b5c2d0efec8af49f75893bbe44/32424300798.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/fae3fd5aeb767d7ed46134a8c8e0fbbc/zeseguzizase.pdfIn PDF document text
    • https://parkettworld.com/upload/files/58621398589.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/84271845611.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c72e405c92a1bdc1fa142a8d75f4f1be/vamudejolefokesuvuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=robin+and+robin+bullock+prophecyPDF 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_off0000bf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF47 10836 bytes
SHA-256: 6b8e324e80e34d46d32c818819adf2dc4402dbb4e74ac8d00fdb02ffb153719e
font_01_sfnt_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 17064 bytes
SHA-256: d4706b18afe2590a22c3372a393ad1d1c790584479e367c88dd8ae8e1937764e