Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd50c051ba5eb376…

MALICIOUS

PDF

132.2 KB Created: 2021-07-03 06:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae517bc64b6957252f4eb24a5d8b78a7 SHA-1: 4b6d7079ad4d3fe254a9bf6f8426f71fea8e646c SHA-256: cd50c051ba5eb376157063a7d9e1b2796cca1b39fda88740feb03efcefb053e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the presence of external URIs and the PDF_RANDOM_URL_LINK heuristic point to an attack pattern focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/33773475951.pdf In PDF document text
    • https://egokituz.eus/files/galeria/files/ripapilebadaginofimudixi.pdfIn PDF document text
    • http://www.celso.org/download/tugaxidodok.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c9c82b2e00e89cea04a0f915526ba1a/bebobovofedafesi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/53178061415.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32434d8c4a---8262282084.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0f56479a---buvipafuwaxum.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5dc7066d---46631602041.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a2491865---wutidawezenim.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i14goh10u2apdqotbl920vnh07/8402963004.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090417d51584---vewuruxonosugidabi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t35aln6a74rdddm26pnc76j2nc/12253408344.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0j085uto28bsajs072d32p1430/kirogalizipawunazetu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tigawibave.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/65554723935.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/96906296796.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2720d896---guzubat.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9b29d3ad0f5ba254902463759c9863f7/63731930367.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/gurinuwalerosunutovebegi.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/sanuranasisakagemexilij.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160784ca6384cc---57022568805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lester+levenson+happiness+is+free+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_off0001a3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3ED 17384 bytes
SHA-256: f33ec3db55ec11fd21ece9259adc8a27f9558122625944109879c946842cbea1
font_01_sfnt_off0001d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D13B 10616 bytes
SHA-256: 620e46d0226edd36176dab8358105be89e9f3865019644bdde5334bf830c39c4
font_02_sfnt_off0001e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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