Malicious PDF — malware analysis report

Static analysis result for SHA-256 528420d903022c09…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 09:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 005e2c78cd7388b984a423ac70eb8f61 SHA-1: 224fe041ef67ce36fcec43ad79df6dd4ddc243a7 SHA-256: 528420d903022c09cebae07141ea26b390c080f8248582f87c10ec8ed02cd4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf50b25fa0---varubipet.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/kajer.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8980cb6fe03b168fe7f55a14b70c8b22/75002739526.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/52028914278.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pipujuxuzotixubuxed.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf8dbefa3---97566110578.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/piparisetoxojemage.pdfIn PDF document text
    • https://rajaunited.com/contents//files/nodanaduzexukamorusebujo.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8bb550499acaa20b97aa5b26a7503f23/getidafonapotagi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/67011088181.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/xogoruwigoxulekipo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gmocvennlaks3qedogmumnbbdb/63045208089.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/98084087518.pdfIn PDF document text
    • http://www.heksan.com.pl/file/dozike.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a633c0c4f8b---87409713670.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/45442388936.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cbea8db1676---53066597032.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210611003136_uj8h7e.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zinorinido.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160710ea27082a---vevujafematipekugele.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160945cd85779a---18190456348.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0e21b32e---31575997863.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d62401c04---24109345581.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/752b508e4cede70c920e8c358a3ea73f/44455205856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=retouch+product+photosPDF 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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 10352 bytes
SHA-256: e0ce7a65eda0f77db7c755be699543ac4fe4d24f5216e9db702977aa61288ead
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 20364 bytes
SHA-256: 571b148b06b818eb8e86423e9bee4bc4e437415e659b0e07cbb6b9292a3060ca
font_02_sfnt_off0001337a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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