Malicious PDF — malware analysis report

Static analysis result for SHA-256 339ab16ee3f95e91…

MALICIOUS

PDF

78.0 KB Created: 2021-07-22 08:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a684106dbebb62cd94eb577d321100e2 SHA-1: af3a74014ed1191929b49d76245eead3383268b1 SHA-256: 339ab16ee3f95e915603cc0b658f9bd89df958cb2335136986ddffa44cb9f2f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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