Malicious PDF — malware analysis report

Static analysis result for SHA-256 f484bdc61ec8ee5a…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 18:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1a056c8baa0b39acc60db88cd6db466d SHA-1: 2c3f8dbccf47d945fff1cf580e5fc3708fa45301 SHA-256: f484bdc61ec8ee5a4d4ca644f40221462d0bea3f8c8eec8b66cc13776aadcf7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/if0h7jkcge87peo1nh8dc58j4o/tojupuvizo.pdf In PDF document text
    • https://foodthings.us/userfiles/file/53720924595.pdfIn PDF document text
    • http://signauction.net/userfiles/file/majibatem.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/taritasasojetuxat.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/48630422955.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/tiligetupopagida.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa6f43718---nemanob.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f133c8be55---39762072106.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/vezasalisejup.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kinuz.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2304e3a017---59597601446.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d864510---82639861148.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/kafowozafuraredosaluzave.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/79da434e2457860a28d817f320b7f572/xabozabatefefekide.pdfIn PDF document text
    • http://esejsc.com/upload/files/rinitozaso.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a66722870d7027e6f55f8a0ba0fbf89b/56052562606.pdfIn PDF document text
    • https://motacademy.it/file/28909562032.pdfIn PDF document text
    • https://ottopianos.nl/files/64851951260.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/19228393768.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/nodizip.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/89jhk1p6ujjfsqc80pt057eng6/46997631349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=time+connectives+worksheetPDF 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_off0000fc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 19448 bytes
SHA-256: 16fae1db11d8e76dd3a5e75bc4a05ca203525a79ec1c8cd928deea208ca9b13f
font_01_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001470e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470E 10496 bytes
SHA-256: 91a67668ad9244445d502232657c0cfb25e8fdd45766ad2a8303279374fe3bd5

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