Malicious PDF — malware analysis report

Static analysis result for SHA-256 2deb452845089272…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 17:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfb9ce8af519b89e72f988c8c14b8980 SHA-1: d367e6a4f37b70a7e1073d24faf83d4320821398 SHA-256: 2deb45284508927225b99bb0d20aae49b1946a4e1c67fec835b32d566c45ad38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files or redirect traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atletika-pardubice.cz/files/file/fugezelabokavab.pdf In PDF document text
    • http://hutnia.pl/userfiles/file/80684021375.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7d7413a1---nivofopuwaxagokidilini.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/zukesatumokowewidadozerif.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/34902196875.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/13634085562.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/95876673882.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/7559761251.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3b22239d---15689777857.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/66918882002.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/29120319758.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/84723446759.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/29796594780.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/javow.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/linajuxegiwobolojito.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c64c831be---zoful.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/joxituzefam.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/98789374982.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55820984271.pdfIn PDF document text
    • http://orenprom.com/img/account/file/85689600848.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210912175120.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94980990129.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vupalasiwiluk.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/nunikiwuxezuwegadu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903152905159697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=makati+postal+codePDF 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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 10388 bytes
SHA-256: b5e8584abb612fedbe2d4c339876ec366507f4b176e6fbfcff8b823bbecd14be
font_01_sfnt_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 18140 bytes
SHA-256: 83d03fafc9b9b1c7549aad56ed9241a66ae255d655cbe52f8b0b8d1e4d049955
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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