Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a67b4fe09c11a2f…

MALICIOUS

PDF

94.7 KB Created: 2021-09-04 13:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: db6e2ee77d583029d0955b0a2d95280f SHA-1: bc1fd458c797330e4e6832bcf5dae081aa7c847b SHA-256: 8a67b4fe09c11a2faffdf4b730b50bf48f2955c0191ad318a20d665cc12920b0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607893f799f49---dazijaxi.pdf In PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/93503082948.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/862ffcd11c44aaaa1acbf981b0edd0df/7994329133.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/vaxalokunevutixelewuji.pdfIn PDF document text
    • http://goref.ru/files/file/domesepup.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/99852153370.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab23547aa8---1377479606.pdfIn PDF document text
    • https://ranagro.com/files/60384301769.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9958846ad7---7044599847.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/19850329343.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/88f80a4dfeb28dd38a92e997111ac91c/wesuvivowofidu.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/72035687188.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907634aed80---24361669023.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/35117236199.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/97587741223.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/3833993423.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/9850201618.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zovulixijirukoxib.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3a2942fbee3dcb6249a822d626b01e38/29939703300.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607215b7128c9---74292088166.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/papurazimigoxupit.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42b823322---31364663152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=synthesis+of+zinc+nanoparticles+using+plant+extract+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_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 19464 bytes
SHA-256: 2f182269e949ab590c614bfbfab7dba29914ed9ec1753a0fb0ce309c575302d6
font_01_sfnt_off00013a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 11352 bytes
SHA-256: 50d3a5d02dc45ac8694cdd0c2737755264cb615a1772af008326b09051deb357
font_02_sfnt_off00015492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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