Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca90ea57e91e30cc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 06:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7639ed9f9abb0acd5832767b6ecfa8b1 SHA-1: 114ea430dc793c112590b088b7d787ca74641dea SHA-256: ca90ea57e91e30cc55df1337f4b1f4887a27a24c030bdf8b39a4770aa26eaadc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609183cce841f---41571125355.pdf In PDF document text
    • http://zespolbahamas.pl/zdjecia/file/52018840638.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f8b0361e0---fojirop.pdfIn PDF document text
    • http://lactopad.com/uploads/files/66150244751.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1b9c993e---94157242060.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/90513207973.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ngd7lgqf07caaqj5c0a99pb48j/7664687522.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dabibuloziline.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c05a68315e6f7d8ad181afc84f86ac56/diroben.pdfIn PDF document text
    • http://ashioke.com/images/library/File/41009402297.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3efefd8c---25986653643.pdfIn PDF document text
    • http://yilip.net/userData/board/file/74530124190.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6f04bb32431b7ce64c62875181243be5/kufexevexapujexuzovubus.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b7ff6f228c5a8d9e9a6de11acbacea1/19400999884.pdfIn PDF document text
    • http://gibisch.info/files/files/98380980361.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c5908ced---duzomuxagolif.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dc311254---kegolemetebabex.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lndr4nsa6k21c74quh1kovar4e/wawapibegikup.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/2368706442.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/konesixagexaxabamijit.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/xademurogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=english+rhymes+for+kidsPDF 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_off0000c0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 10728 bytes
SHA-256: 07e2c32108077290c43df034da3d591a2ccaa76ebe20d394a9a2052ceef05ef1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17880 bytes
SHA-256: 37ce4543dbb9e54fca0db5278bd1003bbb8b5d16ff5542d29a575bbea84def6e

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