Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ca1840ecbb7f85…

MALICIOUS

PDF

88.9 KB Created: 2021-07-22 08:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73650429d0e52bcfff91b80755a75628 SHA-1: 2b2555c78fad8e8519dcf86115871961b3b6f676 SHA-256: 58ca1840ecbb7f85589119ca1cdebfd098755ab33a883ba45fcce58b401ad04e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that this PDF is designed to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vector-mebel.ru/uploads/files/92356744900.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/femerawi.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3rfuq8phieiheac3h6be5jrhup/jivobezine.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/788ef9a1cdce70c7c71ffd35b921900f/41984881079.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/92365636314.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c42e8cf47---fuwibukafirobop.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/mewuzoxa.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/49636484665.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779fc36715a---21067230811.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/pinanon.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/54624105369.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/jebifokuxelugarazewiz.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/tijegesaxawefen.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/nufukiravisorasezuti.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/menizulonugatufonavedow.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086b532d03c0---voladunafegigajev.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1cc98b453---tatobekumitoxalo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a720257f3a---73100364837.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beabcf1b513---12986355357.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/56487802643.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6263d80287333188b1a0d18eabaeb65a/lanesanuriz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ccafd753999---vavedazik.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2cb138a4b95104345c3e1d3d6da4d1f9/71408875090.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f017c353f5---32814928580.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d848f0cbd---mazogawiteritiviliber.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=empires+and+puzzles+update+problemPDF 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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 18792 bytes
SHA-256: 106424f6426a5dfce8cee5fc57a8c9bf56fea09048657e7cc399b6f39665bdf9
font_01_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 10836 bytes
SHA-256: f075085659d296a2b0f05ab947f53eeb212eb349db3c98792a948c3e59fc5626

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