Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd88531e5ab50cfb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 00:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6338a37efd4b4164204e482d09dd2cb SHA-1: a50261723abc002f000133198d8fec43129cd4af SHA-256: bd88531e5ab50cfbe8694456a5a1164a7a1e024d569ddbb14c081c6879abc9ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to malicious sites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=how+to+select+multiple+images+on+lightroom PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/bubomazinewefevagexaz.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/58381754972.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/87203787477.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/pajavusarutokafozuta.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kavazot.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sekerotuvidelo.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/doponujabimotawubun.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/dosafezeripe.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/93462785914.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/pajetaxigofes.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/3816001400.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guruvi.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/fagajumidiretuxo.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vuriruzafidugopo.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/titanemopojubelenalego.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/76883482795.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134649cb3a15---97421636060.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/91815930672.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161383fa668000---zatibilexonipizemuvobev.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/wonofunabinazewax.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1415c4902ec3e1112feb7b40cc0e10f5/87646199874.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/3869849055.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa548f1e44---vunotefizaku.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/nekunesotumesozebunilofam.pdfIn PDF document text
    • 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 19024 bytes
SHA-256: b8c334fe8f0d6bdfef7c7e9b08fe4cdf296a593fa1d7d156da126a8ce86befe2
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 10996 bytes
SHA-256: 7dd84a4aa521f4a546e6fa84d6df614a0b04ed951170a355583013d45e89c08f

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