Malicious PDF — malware analysis report

Static analysis result for SHA-256 963bcdc90c698306…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 12:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c5f6caa7cf007856d4d31e4b89275a9 SHA-1: 9999ab4c16ff435d6b125e88a25e38eea52791c6 SHA-256: 963bcdc90c698306e445eaad971a0443f2a8a791ab87b52b931f9e622238f068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=how+to+add+signature+in+acrobat+reader PDF link annotation
    • http://getampedmag.com/ckfinder/userfiles/files/31160373242.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/62ce60c2379d5b0a8ebec9bbdf575260/52015948723.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff074ebc70---zelakoju.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7d745229ed8270ef040bf3cf9f18303d/poxewebodimuwegev.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/norolizudilivudivuridere.pdfIn PDF document text
    • http://juentai.com/userfiles/files/togagitetutevijovado.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a070d5334a---8425623647.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faba5795e7b---dijigoxulojavojojerolizi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fd6b2028---popidatadisipup.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609511f03d0a9---nixigojaza.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sunafupikidekumegonoxiruw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cacff78ee1aba3510d9d0a91b2bd4023/50702646797.pdfIn PDF document text
    • http://castel.lu/userfiles/files/nesidezanademovekuwewu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/zitewadizudipitajason.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hrv5ufj8e0lbug26flm5djkdqj/11444277495.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tasitusegavamegifu.pdfIn PDF document text
    • https://eurocomm-italia.com/file/95893492408.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/50498033311.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e5221aa373599c91578d8c4070a2891e/buwugirikakazululo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725b631499d---lifuwaxapiledoleteteja.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronexujutesu.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/wolifetegume.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/kidirizapimuvowuw.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/wofovumavijevajozufav.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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 10816 bytes
SHA-256: 119159cb6777eb1c84456ef0975e319ff8803a0ef3f7ffdf84a1d908a6b45588
font_02_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 16936 bytes
SHA-256: 9c5c1c91a7737cd74378b1f673246a02fcd947a07fefa5993668ebefd3bb9091

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