Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a4afa5ff4d4cb1…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 419b30facd65bc4e96cb1650e76446f5 SHA-1: 8456490f7cf146c4dbe2f782b39def5a3fe645db SHA-256: b3a4afa5ff4d4cb1f326293a4915a95dc428ebf384186f56ebf9af0e29cb4c9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=scheffe+analysis+of+variance+pdf PDF link annotation
    • http://ratchee.com/ckfinder/userfiles/files/migatasonijilipiwobaj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf40ef3d2---fatowerujenujuwazojodoz.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gexivosigitapum.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/51517456949.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/18312162393.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/30555779829.pdfIn PDF document text
    • http://geodez.com/pliki/file/46492760414.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/kuvuzukoruwobodexutizu.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/90194962279.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/tegulisejujomaduxa.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15be46abd---77659592265.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db64f3d0ad---rebuwuwiwe.pdfIn PDF document text
    • http://fxlcd.com/upload/file/69883096615.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/54156947323.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/dutum.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1574cf42e---zidelibuwi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52975d6393daea19de89ceb87f251813/gejif.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4adba7a5e---zunirazuwuzoxi.pdfIn PDF document text
    • http://splogservice.ru/content/file/67091043557.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kepoz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f8e15ec9---neposukoronuziw.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607768c49ade4---43709280907.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0601d841f---kasitepes.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/peregevun.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9c8b764db6e3d76f8bb4da13955b0591/28344316365.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/molurawisojalixefaxarore.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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10876 bytes
SHA-256: 7a97a8dc8746f8dc5665374756abfd833c95172500b149f674704af7642dd805
font_01_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16932 bytes
SHA-256: ad499d51f7503bffd95dcb21a268e4b9bf23904c50a095f0f8e5826cd8dc0a36
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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