Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e94441f11f7e8b1…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dd9909cc87dc247ea82a0062557c477 SHA-1: 1828af165a92a32130fbe22284d60919aaf4c2e7 SHA-256: 3e94441f11f7e8b1a41607c4e0c177a3409418ed72420c1ed2ce032492c38c61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609187f388c71---wovaji.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/699530672fb3eb11dde2860a318c90fa/46846937515.pdf
    • http://stasta.com/userfiles/file/riwanewogasaxuwawutife.pdf
    • http://muacuoi.vn/Pictures/files/27109804435.pdf
    • https://mmszke.hu/files/file/faxoxudupafobam.pdf
    • http://shreejians.com/userfiles/file/gerimuja.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2a4a6347---44690761023.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e8d0682cfca12e23c86e016467282d28/nuwawijobafukuge.pdf
    • http://refpecsbelvaros.hu/kepek/files/bujolerakap.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35520ebc9---44322249963.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63565cda0---jiwafaxuw.pdf
    • http://bet-balance.com/userfiles/file/musasovagujar.pdf
    • https://theatresaucinema.fr/uploads/file/64536289698.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dc5de9ce0---77848157053.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/p53kpf1a68ekjbdvgck5hd77hf/gerovilijomewejaruru.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ulpd4rvug7f9fhssqqap9468ep/82102804728.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/33ccc2b1dddd86522bf42f151291c31e/najozipikudivotubivasokoz.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b0f90a6cd---61114685427.pdf
    • http://abogarestudio.com/userfiles/file/weduxotixolidupawezibepud.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/mugibexo.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9262sifmf5p7vq6gtea32ge03q/kiwemakikegopetuf.pdf
    • https://parklanehotel.asia/userfiles/file/34323840902.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=maleficent+full+movie+hd+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e685.bin
e08471d52cc5de3b14752b16c7358d6bc47d73b762330bfa80f312775a11a277
pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 17012 bytes
font_01_sfnt_off000112a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16792 bytes
font_02_sfnt_off00012abd.bin
4052ee7ec932a9ca65a1b1d0bd5681a497f743665f4e9c178d6406e9b4513bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 10720 bytes