Malicious PDF — malware analysis report

Static analysis result for SHA-256 19455d88d3cac8fc…

MALICIOUS

PDF

276.0 KB Created: 2021-06-27 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8391a84937950b71c5ce57725047ff42 SHA-1: ff95807103f8d549767f9922b51652a4d661f3e3 SHA-256: 19455d88d3cac8fcb92112f78e997ae84e4094f1599aa5c12a58a74804c01c4a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress upload directories, suggesting it is part of a phishing campaign to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a secondary payload disguised as a grammar book. No scripts were extracted, but the presence of numerous malicious URLs points to a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=english+grammar+book+for+class+11+pdf+download PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4afc82d677a7c799b4a8538aee346cb9/69873494563.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bc67f5ed38ec4a59e3ff684e9f2f8eea/xogegadosusirisila.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47ae4f940cff00a34ce177b202a16f45/3224812665.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/765b570433b4004651611dc37e2b6736/15126612804.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052120480939.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7ef3577f51520c1613d1c89cba3e8fe4/99380467830.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/ec52d2efaff62732303371c0125fdaf0/pedebexosip.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mupeguxo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f849641b---73612238093.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b6bdd54cc19097c9dddb6ea5c2b195da/voxifadoxuwelizo.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hp8vigvndi1u9omu0ffqkd171/boxakid.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/wajotip.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607571406c8ad---70301755302.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1969aa1cef3859330143c8f305d88274/tupokudeliwuzifakexobudo.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/vimuwozivobeloxazoratiwal.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84917446c---19866189886.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/95218705007.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/dcb60b76324bc78395d8e626254de8c2/kogogabowoxugiguri.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/27078663644.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f54164485---14213980245.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/bhbquek06ula0h4ln5h6sjb5bo/zuvuru.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2ba75f415853ff64cb614d7b5a25f8b7/86413798638.pdfIn PDF document text
    • http://fittbikese.hu/files/file/tazikikatisov.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccbf54c6d---tesodorupusonowalewetakel.pdfIn PDF document text
    • 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_off0003ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DDD4 18856 bytes
SHA-256: 50debfeeb73a2317adabb244d8cd43c855a7790a2b5f828886c27f4245c693c1
font_01_sfnt_off00040f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00042764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42764 11188 bytes
SHA-256: c0b8fd4c1c949402d26bf42b0a1afef0fd2e902dde8037c13b9cb6fbcdbbc5e1

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