Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b45ddc4a7fe5a7…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 23:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9474246c2a2c171772161c8356a04149 SHA-1: f93a1001bbd7abc273b856e5fdb45877e48f5c90 SHA-256: 85b45ddc4a7fe5a74466b4a88a6a0dd6932a8088af5b42db554d017368d27ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the nature of the compromised CMS upload links indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a10fea6dd2---41750665855.pdf In PDF document text
    • http://bakoca.hu/files/file/42116850898.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/xenujixodometurebesupeto.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/26086337414.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/fulovokefag.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ai3o6cgncb46jnr4h6gs32vdf2/famibemesalomulifiguxupez.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/jusowubovidigidaxut.pdfIn PDF document text
    • https://marigabung.com/contents//files/sasiwanajemirekiwu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/hsph00l4amoeevbri2f4pvbtpf/45887782393.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9e53dd4cc---37678376829.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aaf8c3483---nagewisurexo.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/65854662911.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/158hfji9sth4b37ftrjqg42t9h/8069813654.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d61b0358cd1666adcc37647124b2a39d/50758202115.pdfIn PDF document text
    • http://modern-pro.ru/files/file/munowunagaroniw.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b7d9b769e3668345489951aac9dec3ac/85801840521.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q1qt7pnljurhqsc4smrj18hbr4/14036838630.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/bufozamirarunusu.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71093848951.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/8301987178.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/42732907711.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/8118312122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kivy+cookbook+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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 19236 bytes
SHA-256: e20aa169dfa64230785bd0d95ee78d01534a28c9eb1484a8a29e82fbd993820c
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 10204 bytes
SHA-256: 3946d4daa6fb8616bab8475df0fd5a053664a1c12fd4cd701016444536c12cbd
font_02_sfnt_off000140c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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