Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedc541b0ad4496a…

MALICIOUS

PDF

130.4 KB Created: 2021-06-28 14:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0abc52362d75e21dd0f872716fad5be5 SHA-1: 72388c2a2400766b6b61c4ea1e62bfcbfa72bd8d SHA-256: fedc541b0ad4496a4d030de77273e465f8a4bd6c22f6a170d4ebfd9e99a4a277
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://pajurioverslas.lt/ckfinder/userfiles/files/wuvewapijavisoxe.pdf In PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b105ed1ef6---96235286063.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/26716340710.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/20794728132.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b45ccab0---purikiperoda.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7404799a80c5f74fa9a2239132b76f/47009293091.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2c809d3d---mupomoxiliwugovus.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/tosuvopomoximop.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/6222889967.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/80771626106.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/93195401526.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0af14556c---nojubuvaxem.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ddnon0tcc87jarr893i1r6u79i/84721183938.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd002e3c42---tuxolorolada.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6af1c26a5---9419397542.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/36b85c607d75fee9311199bf861f7e56/sobejajuvopamujujulo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c0f038f8---mikipivazemijapot.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/52439592334.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/76044709156.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a3191f820d7764228f39ab780742dded/vegurojaserizewobopefaba.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3241774b95---67424326795.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6531503d---nirosireboxigin.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hu1kf5dr4b5pmqe8mdvu96o217/97579107970.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l544fkg2pok7jc4kh57mmv4tlv/79520523212.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/jawotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=saw+1+unratedPDF 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_off00019d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D3D 10128 bytes
SHA-256: 9442b0d1c97ffa2852185abf3baae65c85b28aa9b34d1f54c2d1f51dde694e6a
font_01_sfnt_off0001b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41A 18220 bytes
SHA-256: c362daa0aa86f092fd6efa7761fe3cd2b15c8becbbe04f0521a9a14b6fd42589
font_02_sfnt_off0001e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1