Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b5455f34735de…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 15:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 237c3947a0873a50bad934f2fe0bcd1d SHA-1: 14e5f48aadaeb2b301b81d7ed5547c74b337e553 SHA-256: f84b5455f34735de5d4d9ece0caa87598d7230a45dfecbee47955bf35ea97714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4143dff4ddde2ce0be1001e914d8f9d/84995085378.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/97709448845.pdfIn PDF document text
    • https://flyags.com/editorResources/file///miwudazuliveloliw.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/nuwekedosis.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a840bf3f49a---57077510649.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/tawemalu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9f1d4ea3cfa71c665bccd321852105ad/malaligediluso.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d7acc3f3c---43463458732.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd9784811---nuzak.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bo72ubbes4fuqofbno4a8porll/susebipawosutinazofogurus.pdfIn PDF document text
    • http://hainfelderteich.at/ruwipadifavasum.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8da6fb6f47---23693192171.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/dd233063f35971f5cfa8b45fdb801dba/mizagezawiwozo.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/kopetimotedifebupa.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/59415591812.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/19647429949.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/jurituguvuxab.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5ef64e5eded63b8dc8fb052977a4699b/timurenunikob.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fixamol.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/55005632348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=derecho+romano+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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10484 bytes
SHA-256: 76638ee49ca5e7e14a57ff8df79a905257bb17d91b0aa192b453cc8d81d5a7a1
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 18572 bytes
SHA-256: 68bfd4bf94f46628b3890b85c183a227c772f94ba070c2f84f5ad7bc3854a0bd

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