Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b127c297409dee3…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 19:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a010d2f1d74598e162f5a2b0b2912bf0 SHA-1: 317221e613943f3f32fc2abb605bf5e27a753c3f SHA-256: 2b127c297409dee36b0b71dacbc90c3bf08563e25ba2859092f35eb3ae69678a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised or disposable domains, designed to redirect users to potentially harmful content. The embedded URLs, while some are marked benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075bfa4789f1---tivato.pdf In PDF document text
    • http://kovacsoltvaskerites.hu/images/file/76025745645.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/387869d31d93b43118491fcea6e0ca3a/51019947633.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de8c694afb550021212c5817f1a2f3fa/rasomipirugoduj.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/mofepidam.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7fbe23ea---93692029595.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/budamebudatewekodabokij.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e0968527b3ade91a04b9a8a692388a7b/90406194259.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8aa7c82c3---kudoxu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505092649709053.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/turomowawol.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a9714709adb13f8afa29469099b8c837/36021876027.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/figalefode.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeaab0bdc5---99135790269.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3ed7f729dca1d8e194539b8ac25a8e6d/laribasigo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d4e23177---nuxefixopiwez.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746b5f3701d---regapibufefot.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d8626f37---40870293357.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/93b8c0f24e5ecabce136f6fdd3411344/zatunipazajasikeg.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/11607164320.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5834a1b6---77927211634.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/77515898410.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mogotepuzimaxemujet.pdfIn PDF document text
    • http://otartufo.com/ckfinder/tartufofiles/files/83663367758.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/gosiwoxekiwopagobupexuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=midwest+tv+and+appliancePDF 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_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11498 10432 bytes
SHA-256: 6c3156959bfa6b5a647d4d33c6eebc93f29aecb9fd7492edacfb4d8d5a8680c3
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 16616 bytes
SHA-256: 4f13425b9943d9c8c32b24a76fe8e751ebf0bba50bc2f00e7610506e34a342d3