Malicious PDF — malware analysis report

Static analysis result for SHA-256 61392a436477b688…

MALICIOUS

PDF

85.4 KB Created: 2021-09-04 04:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2a4ca8e0b7234894539e641fa4e8688 SHA-1: 68455e2c3e79cd1a9db7be44acebfaa0ef5259c2 SHA-256: 61392a436477b688345a74a7b41cee2b6805ce55a6527550a157d227d1a9d2cd
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external links indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c8fcbbafbdccb351bed183f3d939f2c9/zanofidaduguvilavaf.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/14125402980.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/ruvazazitodugokigenogiso.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc6138efe0---nanesuwi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e0de3a7cb---70445030569.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vekexajokipogedopat.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/11043027947.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5ab84b96c0753f9d37fc8cb1fe1ae228/wisukemagigeb.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/wajujibosesifotedazoz.pdfIn PDF document text
    • https://binhvi.com/upload/files/begumugajebamexarunesokat.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f522279e8a---letipidikalanulomupe.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-11/20210811085947267718.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd61b68ff---98550729042.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fufeleposopi.pdfIn PDF document text
    • https://kamedia.vn/data/file/welufemodigutuduvubug.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6765f87815ac858b351969483735b732/nubikomiwazodozatapufida.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102dcd300052---xogudipepavovox.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/17176499183.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/13831997047.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bde30fc19---bukavuge.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/90716331897.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6427e413---49023665640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+tablas+dinamicas+excel+2013+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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 20496 bytes
SHA-256: dc422f32e19f08e08afbc43e4ea13db02f15470c56d081b849a94169b0cbe651
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 11604 bytes
SHA-256: 0f8b66f20dae2d580aa8ccca081497be747791addba6155ea0b6ee69454150b8

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