Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5382fd816eb3b2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 00:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33f02109f200f938899875a4dd33c4f0 SHA-1: c8bc4b9326d62a368e250767c85618096893a6fe SHA-256: df5382fd816eb3b2bfae58db5a1945e169a9ca493be44ad15f634dfa202c1998
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites hosted on compromised CMS platforms, suggesting a phishing or redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were extracted, the structure and URL patterns indicate a likely attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://e-hematologica.com/users/file/86116093109.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16145cccf2e646---xuwonobumulomivobon.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/0946e11a7693873bfa65abf3b4b67722/67644187437.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/18399382930.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/vobujewatuwibavejixer.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148c2792ef7a---fezatonalemaw.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/xipatevisizonebuleto.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2eee3e11c---59647396099.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/16831416312.pdfIn PDF document text
    • http://offerparts.com/upload/files/resiwejibus.pdfIn PDF document text
    • http://wawa757.com/uploads/files/fogenegod.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/xalegumitejuwapidor.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/50522460718.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/47231197870.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fefawalaz.pdfIn PDF document text
    • http://domario.ru/userfiles/file/20309035444.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/40429762538.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/80848066009.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/junizonimixip.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/joq13upklargss3mtblp3aad03/406402097.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/21218926748.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kefatajirikupupi.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/rufozekusuxob.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/xanigilegek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ome+tv+app+iphonePDF 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_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 10292 bytes
SHA-256: 6cf4b9490a416ee30245e54b2da0aebd94c295b6bc00203f9fcc574628154702
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 18572 bytes
SHA-256: 7efbc2e479b44ce0deed726a9f35fbb561fc6e7fd2b552385ae90b2190583826
font_02_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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