Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecf750d70238704…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 00:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d555c307cdc2b0de995b05d93daf01f2 SHA-1: f758e02660c3d771b0a5e5375f734f36bda1151f SHA-256: cecf750d70238704d7bb46b928aba37416486ef1137d7710f367ea78e81e0b48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using non-clustered link farms on disposable hosting, which is a common tactic for phishing or malware distribution. The presence of embedded URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dsverano.com/UserFiles/File/53041889371.pdf In PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/wogubowakegajiminixulare.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/zizavezokiwovusil.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/26917468218.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e14505a8bb4429ff22dbb5464fca73ef/jazudemekazibedujujafefo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/19b77d19c9108fc7387fb48fa831372e/98600602770.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/gulimifavumodemipulelasom.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf006222b6---54295071011.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/79038587807.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/17105715917.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wamafibagugegugavuxuxa.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gonozawimumodejeto.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bb87a5f138f105d570ee495ce3946380/46309805877.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fukikogowudu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ea5105c2e8fdbee06e132b12953610ab/47134296393.pdfIn PDF document text
    • http://skinanniversarymall.com/userfiles/file/wenovukow.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/21d887e149450373790a499486b84152/12419138785.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kinarixapejawajib.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/1418569807.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be91060e3---dekez.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/44446888821.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/pidulid.pdfIn PDF document text
    • http://partnercable.hu/files/7466442406.pdfIn PDF document text
    • http://emeat.ru/var/files/89835299456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=company+law+cs+executive+scanner+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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 11280 bytes
SHA-256: f29cd13ec749cd9f5ba89255d27e97f7f54c54faffb23a97261fd6d97abc5cca
font_01_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 17900 bytes
SHA-256: a838f0f26e231320513568c2b866d8bca0f8a3b276eb735174a8995bb3d4b7d3

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