Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9f754972e28fff…

MALICIOUS

PDF

124.1 KB Created: 2021-09-05 14:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76df7128b948cca9e6c2c16321aaa700 SHA-1: fcdc1bbc0c22c3da17d3d908f58218e6409e786f SHA-256: ca9f754972e28fff702c32023232306df7e9c4c2a55799e00632d7f34f7bdd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ufnk.fr/app/webroot/files/file/27065792972.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607408d2e7bb7---71585698544.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fajej.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/bezabaxedivabak.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108300902312534.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607843ba66fb7---tulodunizeze.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6b673ef674c963ad62ab95d0ba10042b/bixibom.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/kosonekurowak.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/08dfddc8864e1100d68dc5bcac05064a/nowigubimaligizagorekezu.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/zegef.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/60831715425.pdfIn PDF document text
    • http://bjjiffy.com/upload/nidiwajowun.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607288fd2a6e4---sewikigipewijirasineviv.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/99767199864.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/30925078917.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ojuftul6dpe2cui0qp18ifb8c7/virekeki.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161345df38f6c3---buzujuwibas.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080381e2aa---femom.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167ef964d1f---9856259351.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/wofakakuwaxepobefoj.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/tevarosobofiwa.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/36095386973.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3d87ecd19---lumasodewazulotuvigi.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/papuzepomeginilisatadop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bullous+pemphigoid+review+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_off00017d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D79 20276 bytes
SHA-256: c2c34d67b44804a24fce1b5d17f0262174fcba6c01db9eb4d7a61facc8dcc0b1
font_01_sfnt_off0001b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17E 10888 bytes
SHA-256: f0fc50b63c579c67d828506703eaa5bf81771e37f1a157e17b5cb73510398101
font_02_sfnt_off0001ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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