Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bdefc78fd6c396…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 17:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b79c880034744ebaa6d490b69c35543d SHA-1: 4a23cd6f84ce27a17c28f0744525186d9f0375fe SHA-256: c0bdefc78fd6c396b2c444ffb87b7742498e9afbd5f7d278f3755fd447275b1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dighakanchaninternational.com/FCKeditor/file/49792992332.pdf In PDF document text
    • https://glycocalyx.nl/userfiles/image/file/17721867500.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f88b708e7---90916949683.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/lujaganip.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/90371173534.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160823c9728b23---zasireripodulasulubifabuf.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/48566714635.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/53356169156.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608304507794a---zoroxemunogatasuvavoxuwod.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wavebolusixexa.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/81356498078.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160859747ce345---18152834994.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/kokigatokap.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/vewanudanepetaboleveji.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/91174850698.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b00c859b---fekosujiwegetamuzisojeder.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210714_899400CBA225D5C2.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc487a893---dewofapibi.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/28490238024.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608854a492e18---darimitonufubudobuvejosez.pdfIn PDF document text
    • http://apsons.eu/files/file/tometalekodelujipe.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5d6b199a6e1d59923b906f0b56e1e3bc/17900211249.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/53022872824.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210626075210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=appsc+group+1+syllabus+in+telugu+medium+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_off0000b862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 17696 bytes
SHA-256: 0a4b8e6232a52e2428c3f75621cba66f28c69c1beaaeac0ed9b736024dca3135
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 11352 bytes
SHA-256: e98a1a60c3ef50e2cb49241fdf26465468af287c922729806bc58c70c7cdb271
font_02_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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