Malicious PDF — malware analysis report

Static analysis result for SHA-256 532b8daa0b17bd4c…

MALICIOUS

PDF

79.1 KB Created: 2021-07-16 10:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f390f5d8de8f751e8c64da1e88a106f6 SHA-1: 01adad7c85faee3ab916d13f7dec4c11abce2907 SHA-256: 532b8daa0b17bd4c38e2d55bfcaaa6c437f9ee46ad6c2fd7674995fdbe5516f5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs are likely intended to host malicious payloads or facilitate phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b070f742b3e---dopezotutafotixijozuwixu.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1dfdad9b6f4eee5e8ff9cd61a8daf076/kimopaxuxo.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/11696962712.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/mabizopuk.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/35748633624.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b115a603b55---78667469108.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/93586560164.pdfIn PDF document text
    • https://dm288.com/slicice/file/24277251003.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/38213209874.pdfIn PDF document text
    • http://cecev.com/stockages/files/safoxetewevetekawoze.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4297a800b9---tajugokimonijedasa.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/35ed58c6ec4cc8014c92225f0dbcc578/7603962019.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3c749d51a3cf71050d28d1d6c6b74bfb/64289319429.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pp6ccnabuo4gd38q0m2famvo56/vubexeg.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621481914.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/govijeku.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/12671091356.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/kavebesigexinimuwupovabug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=changing+kg+to+newtonsPDF 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_off0000d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 17180 bytes
SHA-256: 6fc90c6c610bcf5a146b1e1629b4060ea8748a4b6496f61d809c1841d667541a
font_01_sfnt_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 10452 bytes
SHA-256: 37b6fb71ca967d75067cfe0080027cd42f6e3a56b57f7e4d4a88e60e82c318af
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1