Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffca475a67a0d6f7…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 13:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 488ef8fb69ef2f1cb7b3be5ece1d75bd SHA-1: 299649a425e9edaf1ae439a8ee7963c094728714 SHA-256: ffca475a67a0d6f77428a0eca047fd06a9b0b6f90d968171fd61d24d0d842184
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of external URIs and link farms indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sostrevalli.it/userfiles/files/18289633435.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b135a71082---42949641649.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/divexagigepagogudebivux.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/fvlghrp32m1gehlh3pjt8oq2qr/26856875313.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/80192515227.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/032e4da56ab261dc3284881ba4177f76/kuralogumebixanukike.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5beba594a20efbfd75b185e1cf0e8b8d/82903679086.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894863e4e3e---92807590798.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ec1e49e8f---44476559455.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/modipukopiguvaxigi.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/68339945648.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/22704683028.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8c170adf1---vebopaxufopezuwudis.pdfIn PDF document text
    • http://markone-tools.com/upload/files/43955400104.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4b526d07755a7197a72e6ceaf5d0f0e4/remerutibosubax.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/69138795968.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/razuvobap.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/93500977143.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1e7719ed552b2925d39093b55fd2f8d3/32591056486.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/79086c2b74218048dd67d148917a9e40/19967760025.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607867bd6f416---miwutovutunaxim.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e6030f91---lavubujamir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sacroiliac+joint+injection+technique+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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 15908 bytes
SHA-256: 416eaa795d7866ed1e954d9d013a161d0fe6002920bf3fbc839959af465afa68
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 11000 bytes
SHA-256: ac3d5a305f01ded0c54a3feb7d2b64f039439d7c8ef8f234bd1f02fe3923f0b5
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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