Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6d5c1ce84cd81…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 22:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 811942a97479f2b39826fec01ca0f6a8 SHA-1: 2c8d91282d903fac980b04fe279379c30def3144 SHA-256: b8b6d5c1ce84cd81d2bf81ec7ab23f9a268788ca44424675e4922d03431bdbbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF format itself often leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=mcq+heredity+and+evolution+class+10 PDF link annotation
    • https://valve-toho.com/userfiles/file/gijoruzakox.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16106eb204a8c0---setewaxotevimubabu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/foledafarizokabegetefebas.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3c0lr11ng4i48r6q1aqkgg5eqk/maperajerap.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/da4ac7d0aef04c213bd519f02822f6c2/87017815237.pdfIn PDF document text
    • https://penal-garazh.ru/files/zaramojinawopafuredof.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd39c09003---bironuvuxuronazavovoramo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/45f658b9c110e18ac0baa34ff60deaf4/18742850271.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/fosobubajalivalupuj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/bebugikuvumikozejobubug.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2da42c64d---69047357406.pdfIn PDF document text
    • https://kildevangen.dk/files/39593229484.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/t2cpebi8bo0qnmjneh9nmj2d82/68729224592.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87654997553.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/bapofenafonapunew.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/fovorinojuwonabumiwixo.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/49165663935.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/sopezufifamivime.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/77582544974.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ac791b930b9ec94d083f826102c75783/fuzasaluso.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cce066e23b6---70385828624.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/aa703f074811d896ca09f64a62303475/25837619222.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_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 17712 bytes
SHA-256: 55ec1b88feee5c3b67b76319f7fa9ca3bd50fb1027c2c832d5944cae5f56129d
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 11060 bytes
SHA-256: d7409d5b02f0bc00ff0ff7f6103305fa3fb4ce5cc8e846762e83ac520f148e31
font_02_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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