Malicious PDF — malware analysis report

Static analysis result for SHA-256 5741929d651a3082…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e0c73d6b8c2e48ba6ab1a3266ccaa71 SHA-1: c12ac6942d6a083e738450dad663a9111b93f57e SHA-256: 5741929d651a30828a537b58a3f3caeb632837d7af8633fbbd589e9e8d61d43a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. No scripts were extracted, but the presence of multiple URLs and the password archive lure strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=led+zeppelin+houses+of+the+holy+tab+book+pdf PDF link annotation
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rr2ndk8jqrd7bet60su7ptqd32/12202106575.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/patak.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16118ef49023db---lemedowuwunolesi.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/25081696505.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368bfcee166---24059924607.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/60112dcb12065079986934e898d140c3/zaxasixenos.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5585b1f3---92918893928.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/12979705459.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/84450138683.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127acac01f27---11440744940.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/6381832527.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/2m2h3qi2g5kcpu0suqjeu5q5jm/tabigusedapet.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/70959836536.pdfIn PDF document text
    • https://majubesar.org/contents//files/34840508093.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42347888231.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1611413bdd6172---faguwotefimerijisigujoler.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021080105314426.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/48655780966.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b780596ef26---kurawojipoz.pdfIn PDF document text
    • http://laduses.nl/image/file/93743894725.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8680fb9c54f6db416c39af7ed32a36d9/2469481455.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c7b9edb4105824eebbc55a4c46ccc3a4/pugusuzabese.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a26ac1d1---gixifotovekugojop.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c56153219b2---lojowasitarobodozi.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/94357917719.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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 20580 bytes
SHA-256: a3795b6e2a623710f89f27d34073d9907f5fa531b1f2fa024fb38aba67f9445d
font_01_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 10960 bytes
SHA-256: 8002374caae4f3f48097e053cd35c2615dbc860a368483938aad313b481c9817
font_02_sfnt_off00013cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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