Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e536bc324dce8…

MALICIOUS

PDF

84.8 KB Created: 2021-07-31 03:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8ff6ed9d29b095d44f66661231cf565 SHA-1: da1383e6083caf1069a7875c8fc1013e53d9f5b9 SHA-256: b46e536bc324dce84bf2b7b122b6fa89d96c887db24db5b17fc52b5dbf870c40
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites hosting further PDF files. This behavior is indicative of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8ec0b732---jadanobolumemelelofunado.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb03ceacca---rupojilimeboludoror.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a1100207---fufejenasa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6f91d6b52daf08b368e9bf62d79e9649/kedidufabupazisafo.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/fimumikiladimobepu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2ff0d6ae---fegutujab.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/24757532281.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/17698723866.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986e7e288b0---gagise.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/lixejuvekok.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/378ee4bf228e35b357e2f18e8ab5124e/pujer.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c8ef1097---1146110656.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/lunigasagira.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/28839503244.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070711323542.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/samiluxaduxotajomawuguje.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/8c99060a33398d7062edf224e85bb092/72074546945.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/459f5fcb1464b19ccea8dfca2864d187/652378232.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fee3a511c62d8c390f506548d7cdfdb/16215695118.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/42203546261.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/82054254016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cricut+cut+setting+for+oracal+651PDF 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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 10996 bytes
SHA-256: 2f3e4eb77d024bb17f63a6e5ce3405e4c9d880bc9b452b71bb9b3589e790eb08
font_02_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 17284 bytes
SHA-256: 69aea4a0e673cf5d754bf6916870f066e8adc91020dedf5d4d4d393ee40920d5

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