Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb320b053fa922b…

MALICIOUS

PDF

109.0 KB Created: 2021-06-26 01:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a422fb04c1171b64eebec8838ea8497 SHA-1: 61acf3600e4a884a94d6cab65e90af3f19077c02 SHA-256: 5bb320b053fa922b22a31ad3d10811f65049d211bf2fe88b7fbf76be07858fc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs and link farm heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://antifftech.com/uploadfile/file///2021061412593360.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18f78095df67ab53be533a529754c333/gafagovizinikezigexe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b59123ac63b---jilakegakujufud.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/42459331556.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pintuiii9tdjecfo3a9a4nf6t3/xuvebosomorapi.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/71660329334.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6909bdd359---70638351188.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/pigokagikatuninovivexo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b69ec5c3ec36465f1c0e86190cf691fc/zajedukivutexavonuxizad.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5201c55e4---91367883944.pdfIn PDF document text
    • http://simonide.org/userfiles/file/90865967626.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079203c5f24b---tenojobiza.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076cd5ae9---vumilulus.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/deb6945a4cab5f977ffe0620882d12be/jobepaguxisiratenoluwiga.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/28628292195.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/34156849582.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aface3aabc7---tufaveregevomixubuwome.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c358d193f8---83500245807.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/munonudijivulunog.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dceb20b7---33409400255.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/65e6p630i1728i5e7cj49arej3/97667019525.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abee4e5d89---gafegirikoturavidi.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/74986675999.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210515074705533964hvnv5a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=online+convert+image+into+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_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 10888 bytes
SHA-256: 1732c90e7a5f0a710d040f9e8f19b3c84800d887456ce7cde60e64d5c99063c4
font_01_sfnt_off0001618c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1618C 17320 bytes
SHA-256: 9e25fb81959006d386767ef1cf8b535414f6aad2385f41fe8d8c029f2fa422e3
font_02_sfnt_off00018ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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