Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ea61cd0fbad379…

MALICIOUS

PDF

71.2 KB Created: 2021-09-12 03:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5eec69f2df4002203fef46cb891b2c7 SHA-1: ef32d93c3089274eaf17bd3c2ba89eed1dcc3af0 SHA-256: 47ea61cd0fbad379748460da45095fd5c26309c47578c19927fa6ccf96eb7290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=kaavalan+naane+novel+free+download PDF link annotation
    • http://huarui-bio.com/upload/files/mipigizositakojopofa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352d8a96050---60341614738.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/siwuxizedesolafupapaxotu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-7/20210907185939313019.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nigazavif.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/88197808768.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nopopasapobamufas.pdfIn PDF document text
    • https://auto826.com/uploads/files/tutaxonajepipel.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/puwomasaguzabaf.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dr589g1uuuou2pk7qivg7t4hi3/xidipumiponomiz.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/netudepafut.pdfIn PDF document text
    • https://senegal4d.com/contents/files/52509547211.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/87033075518.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/77684566339.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/monoxo.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/lajezovapitefasopuk.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905233634515.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d78f893bc---fesugovez.pdfIn PDF document text
    • http://hmed.vn/upload/files/77527177787.pdfIn PDF document text
    • http://snsi.jp/image/news_file/mosel.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/91685211309.pdfIn PDF document text
    • http://househouse.it/userfiles/files/79564827281.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/pebanuredu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364f719f863---91658357762.pdfIn PDF document text
    • 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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 10132 bytes
SHA-256: 7b2729f4ae2fce0787f03b2af0f00994a9bfdeaed79c1de000e21915d2372ea6
font_01_sfnt_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 16992 bytes
SHA-256: 0a765dfbf5db6e2d55617d6796a2e871ad1aa1ee9db1554308811a8bddc06d45

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