Malicious PDF — malware analysis report

Static analysis result for SHA-256 21480186cec26e09…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 03:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb8f57c5024c2a6d0d9d7931f3da111d SHA-1: ea16d1a2ac2df6f53cc7aed87ee1b7a58cdb134c SHA-256: 21480186cec26e091734394ac6813f94eb8e52b8802ede99356c5ed668cd92a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://singlesync.com/userfiles/file/kejefota.pdf In PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-15/20210915165433353019.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/15563266130.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908140117.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/pafonazilakaposojeduj.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/koxapejuje.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614273cf5924b---genomopubuwipek.pdfIn PDF document text
    • https://tch.lu/files/files/88186851617.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/samosi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ffa9a5b4c000eb6829d176889f498826/nifujalalu.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/nuvofipezekujotatimekavi.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xowugawoliweg.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/tijog.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/lawobenarizokimanatubu.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/96532162743.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/zutinire.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/58646675157.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/xavikofivolupazibi.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-14/20210914150038176507.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6892408d---kiranirejolotizopu.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/rowakobapalunixuzudaxabo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/15869340466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+stop+voice+control+on+androidPDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10648 bytes
SHA-256: 05d6e403d1e29a658ebdabea3dcbc4fe37dc04d0eb767154afdb15ae03906ba0
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 17788 bytes
SHA-256: 65c01754c8748c90e03b9f342910cd472b6e5f28b018cb8bd4e9392c68f700f9

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