Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be76e15c0938227…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 21:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ef7e2bce6866b7fc1fed7c5c7a44e12 SHA-1: e2b710c3235e06f1a17034fe31ce54bb72105d05 SHA-256: 7be76e15c093822737eca4b1aafe3876ce55adb08bf9b610143cfee49bf26e2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or download further payloads. The presence of embedded JavaScript (T1059.007) and the overall structure point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/be47a489c4860aa3dfa7098f7dbbb4a8/53983170647.pdf In PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/96270489702.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35fb8de08f---weregolenisinatakuduf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39b8da3909---87054407587.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc920e6607---jijokavexaleperijomadofil.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/wanekosezusadugujarafat.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161302fd33cb0a---65710377288.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zotaperavugimuk.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2a36ae9b3---32211407706.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea394a3a0---95743919473.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c3cef2fc2---63320539356.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bumadirakosijanizejeguna.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/mujixe.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/94162376056.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbeae61509---gugakuniti.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/sedawotusawut.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/wajudib.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c563ff6e---tonugiko.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/42721116805.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5d31a1ce---30652773555.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/kemef.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/nazigumurokefuwutu.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/wufijorasat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=intercultural+understanding+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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 17248 bytes
SHA-256: 868dc41d8e85a48bb884c3e15d79ae6c406a16f6ebb34dca63c705c43fd7fd74
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 10724 bytes
SHA-256: 9289eddbb97be7aba1556631109e9fb0db9832fdab1e186838a02d122e039b85

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