Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40294d9452c7fdb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-18 16:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bb66b28f885d87f6b5be9dbed99e266 SHA-1: c3563e10c5cf647739ab0c3162d9d38deac66080 SHA-256: e40294d9452c7fdbf027a1640ad42199eee0724527e88ed0103428dc4ec07087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=msg+app+for+firestick PDF link annotation
    • http://tfforming.ru/d/files/nuduxudegoxalisusi.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/rijidugujalarom.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/91005151978.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7fa369fa87446f72afb6563ecb66f7be/35124079397.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/70723751521.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/niwibutepe.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e4c753a9c---xopenorukeniramenizamun.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7fac6542b00bc5a3813edc056d6175b3/kunuto.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/46676919135.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/jagesidoregegadot.pdfIn PDF document text
    • http://med-os.com/user_upload/file/witedoba.pdfIn PDF document text
    • https://mashura.co/userfiles/files/jisimipebotunan.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1e45e490---77972075042.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210911040129.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zijubepasokatazasumemuwiw.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/turebisujugasojurajome.pdfIn PDF document text
    • http://metapolar.hu/tmp/wofepigojuziwobiv.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/66662830512.pdfIn PDF document text
    • http://dfanchem.com/upload/files/totivureloreraditununi.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/60086940862.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/53436056080.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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 10588 bytes
SHA-256: 147b2a488b4f07346746bbeed4497e6a7afb6fe90a72fec52f7d05e3b7d629f0
font_01_sfnt_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16936 bytes
SHA-256: 411228b5a5a6cd1222df0ff384ef5c1a524006e8709ac5ac032273a354e23725
font_02_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1