Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1ac684fa8a3d2d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 05:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 894137e1cbf5d4dc68ac23e89ad8c2eb SHA-1: 2d63625077415315fef9f7c665880b5103bbaa55 SHA-256: 1c1ac684fa8a3d2d6224f1d068aa5f62970492d65029c7917c6e9cd4eec74921
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farms points to an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdf In PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/40411396388.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/58155042036.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/komajijekuwimevuwata.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/35210144846.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/namufenugujatu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zazusiduzogeka.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/3154390008.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/komafetagapimewofak.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d5ef8093a---xodofapulolawawiwutiwotu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/9912268974.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac402b11d3---92768630729.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/fegasa.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tosarijodesavigudolumi.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/54521509735.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/wiruranekagarewidemux.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991c8060cc---pumegajokexexoposaramux.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/93838263164.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/50413212351.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/571071450.pdfIn PDF document text
    • http://www.bandungmesin.com/file/dikiz.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7af62ecddc036d0c017463c538bb185/gutukinu.pdfIn PDF document text
    • http://haai.org/upload/file/18398809797.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/74090523476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+reset+a+onn+tabletPDF 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_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 10580 bytes
SHA-256: c8a590ee361766b762a9672495ff15ad0668345afe22aba04146696a6423d8c4
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 17524 bytes
SHA-256: fc3b37718cfe36e80f8b46ade65f83544d8b5a58529a6e132cddd3e96bfaddf0

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