Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31e544308eefb8b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-23 08:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ecc1b26aa01f1e2aea9199f620c6ea7a SHA-1: f4ac20b8447efc1287579afc9c7b2a9b93f92359 SHA-256: e31e544308eefb8beccfbd65e6948333123bd20f51678f78f1b182d313fb87bf
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of specific user-facing content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014f02eae6---3460259734.pdf In PDF document text
    • https://reparation-mobile.net/userfiles/file/penilefepegew.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/36947244651.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210919123514-sawifalave.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/65284481309.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50733498862.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210908163112392458.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/losamuxirepefuremevikuxe.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/vezamilo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143854122226---buviparasuvewowexubox.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/25615823501.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/90358877317.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/78819259086.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gubevaboke.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tudasanidojunoneke.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/zuxosowuda.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/12071710847.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/71524280429.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/92639468669.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1bbb1c9d8---xipajematewavigukomil.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614680b823e2e---jefeguximaxir.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/54980270083.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/35531278774.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loxopuzisaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+increase+the+internet+speed+in+mobilePDF 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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 10996 bytes
SHA-256: 01b462daa97c19fae7a6f438d987b3a86e07e870cb0ebb4fa6b0b00b4c59963c
font_02_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 15060 bytes
SHA-256: 6d9b74b9df54ff6bf615a3be806c7c635def208cc1cddc2fdd040d7c51bc2c6e