Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde01cc1657b33da…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 06:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e65f1ecb280e3fdf1bff9b9ed88480b4 SHA-1: f03ce90e5838f82ad960cfb60975185dbcf5673d SHA-256: cde01cc1657b33da1966eeffb560e974b63691d4968887ba3dce61be1d3647c8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable infrastructure. The embedded URLs are likely intended to facilitate phishing attacks or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/d11e69058ce926ff80a4744f2c322943/38078822407.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5e27e09e3---kexumobopufenezimerefe.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/052e2290718a3aecdb1487ac26857f88/naberevafe.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/gazogeroji.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/jeduzavu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dbkq8h23gba8qo8924as3pi914/pabavonapisodiz.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/guwuf.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/togux.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/86128541024.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/ranijodag.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/31051059719.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/326647209.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/43726800014.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/adfbac05166ed9e34b783e26d5a5c7a5/lijiletaxofubewaxavimu.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fusoxefelokunuxura.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/86759229600.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/89571204590.pdfIn PDF document text
    • https://alariel.be/userfiles/file/gepirokofemixurinonaxem.pdfIn PDF document text
    • https://goldenapp.net/file/zitudizerukawub.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4687abb97e---solukimaparo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae1980735---23017454691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=trainingsplan+abnehmen+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_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 19092 bytes
SHA-256: c140edb4eaa02005eb9207a2a237ce8c53962a5c8091d35d94b7699758bdec86
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACD 10828 bytes
SHA-256: bd993f48c7bdb94cbc813e4fbf29805b9443adce9ebbe183f9910361cbc1140b