Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9be8162e4aa1b9e…

MALICIOUS

PDF

101.0 KB Created: 2021-07-19 16:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07a7db1ee98abb48bcbf5f3188beee34 SHA-1: 8cd646cf5e2ea125c3559e5684217859648803ae SHA-256: f9be8162e4aa1b9e97d06eb410459333b36fbb54df7db80ecc695b900f95859d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites, including WordPress upload directories. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nullemont.fr/nullemont/ckfinder/userfiles/files/zulebutosenefofajopumis.pdf In PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/ziwog.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c752b8f728fd039a18c0d9c368a0cc7f/roleroz.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/62484050748.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a867de8ed36---27139650192.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/8c5c124241290fc5036d47ba3e5c6b40/78479362023.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/413426c87b7280109613891f42627821/lutararadudidazu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/remofadolasotamuzurunesen.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/76554157889.pdfIn PDF document text
    • http://meskerjager.nl/media/files/1982496260.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/92663330979.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/31698220083.pdfIn PDF document text
    • http://berbun.com/user_img/file/6945540250.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///53350777204.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/52358603890.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca78b26078---vatajurifuko.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mbj0b9pmn4a5dmoinamo5j17pd/14112018848.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953743d2e11---nisisemunazolola.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/pesavas.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/7147447880.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/44880527218.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/11336668082.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/pimaduraneriv.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/jadikuridevena.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/gikakef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=going+down+on+a+girl+meaningPDF 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_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 17884 bytes
SHA-256: 11515b995eb4a7a450c8275320af4799796b3b451a7ee048ad9b81f299283e50
font_02_sfnt_off00016dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD7 10452 bytes
SHA-256: 30dedfa5fbba0b6976f3be77c51eefb4ab15d8a36bab7752097bf07f2ca57850