Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9541ffdb481c08a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 20:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e38f357199b3326df3cf25c153fd1978 SHA-1: beae2a15d2a53dbd26d20d88972db8f1182e0efe SHA-256: d9541ffdb481c08a6e8070a25eb4df0943fec2201bf0927b2dfc950dbaa52cc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing/malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://beytarimcilik.com/admin/editor_resim/file/35399683807.pdf In PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109230326112121.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/69768447651.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/nemigitotejujokuw.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/99434474882.pdfIn PDF document text
    • http://marketingnews.fr/images/file/52599290392.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/59378442327.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/43991870223.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381df925567---valivimugote.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/39352864258.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/55577295187.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/16539032383.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/tolazukisola.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/60116084793.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/40a75fd1c056ef6aee2d16f32e350c46/gotifepezoso.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bodezisirafajodixabowi.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/159fa40a0239ed110c1758bd5a8a5b32/dirideselipureviso.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/namasomog.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/84694222495.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/87675274129.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/datewejid.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/3710425272.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/40184339667.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/pelubebama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hairstyle+for+my+face+shapePDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 10744 bytes
SHA-256: 2c439b1ec461526971ddd8ca6785fef67e4513f3cf98d8cc3ddfcce8ac98868a
font_02_sfnt_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 18276 bytes
SHA-256: 5f7f21e7c0145e1595fa619bb0792b309c2fca001e056e45caedce09db005a1a