Malicious PDF — malware analysis report

Static analysis result for SHA-256 638f2cd63904c330…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ab8bcc649507c30e88b0ccd5c086bb8 SHA-1: ae060cd8f66dfe16df2bacf3f61d6c06866bca2d SHA-256: 638f2cd63904c3307419b825557c4997f7bfebdaad2d74093f540ac08343d86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=eyes+involuntarily+move+back+and+forth PDF link annotation
    • https://arch.ua/ckfinder/userfiles/files/70487863561.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160923429b21ab---lotaxo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d7548fcf0d3d950f3f4708595f27c82b/sunawuridaraxupogepu.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/kijowojorud.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/83308620741.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tomsmqn1qqdb3iks8a8a9m46ih/24428370119.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac50373b5---xofuzo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/79043613553.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/banemo.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/mixeb.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38b122e8e0---jidevu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/tozaliwatorilukij.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f7a644648---66134809036.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/bafimuzafiwenizop.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/wubowulisoxefefutunowaru.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/75562982392.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/52879690521.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2d9413676dc8b24141dd9a5f70b71ad3/xelefoj.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/sifiruvumijijuruwux.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/21237837981.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/91093973686.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/lodazatapupasezudaneweto.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/dujomofasewasugabimo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 11236 bytes
SHA-256: 71cd7f6d350cc571f7b6a23728bfa7c0a7a659dae4c732b23bb11b52dd274870
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17092 bytes
SHA-256: b8819e2c9c1baad641ec98899c1751a47612a4681ed297febc42a322012b806a
font_02_sfnt_off000132d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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