Malicious PDF — malware analysis report

Static analysis result for SHA-256 c381986e3e1a3779…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1059d5dbd7b222f05f0a7233916c6594 SHA-1: 9c7853f72b1051aea8be6dac79937e513ac3a11a SHA-256: c381986e3e1a377907ce0acfb51b92c67b797f8b086cfcb816808e6d4e6496ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware. The primary lure appears to be a fake free download for iTunes, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://oniceh.ru/uplcv?utm_term=free+download+of+itunes+for+windows+10+64+bit PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079574e86738---4188012644.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/99462925658.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/89646702126.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/95c0f59700a3c0392274da55884b5bb9/73454983412.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29474910050.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kanominewunasugiludi.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/gubitexuwe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6ea727e1---19910869942.pdfIn PDF document text
    • http://asfalon.com/__files/file/70673946013.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/tulafepevasamenebamusun.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210622194145.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610445c773183---puxiz.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/daxanowalarajame.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gasorelatagepibam.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/24a42d4c65b431a6e324e0186cf1b79d/36346745102.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16117f8001fc39---58578050521.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/defigivuguziru.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/7000878783.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0999f930ef---konijemegodeza.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/kenujulobotijakajanal.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/904cd16418306f48441eabc6c93954c6/75909022802.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cb7hegc1uqe6a6h7rioougs062/18084641496.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3aa1b80b---76749767970.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cae364be3fe---togasamexiwovomivufaxom.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608546169a399---rorapesarugiwasudonixodu.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210821132820.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_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 11068 bytes
SHA-256: baf0a61628b6af713d096c776494402b5fe2cecc9b2bcb8b36a9831673322ccc
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 17868 bytes
SHA-256: ad37b03f48e954a0076cdadb68f84dfb10e171638920ac36f1230944fe85e6b1

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