Malicious PDF — malware analysis report

Static analysis result for SHA-256 4532df2036885560…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 17:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87ddcaa4a827a0d318e951f82fc725ff SHA-1: 5db3578459f0bf3cb92c3e2045a2d738a42d4d86 SHA-256: 4532df203688556074764f79d41adcd5ff0c7a237d71519033cae16b13aac9f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress installations and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure of the PDF itself is designed to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=livro+sozinha+no+mundo+pdf PDF link annotation
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cdd7ee396d39abc49bef277bbd192ab8/sifizezefagelus.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/648c2b386f40b0ff7bf95d0e97b53f6c/tinerubifaz.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/0be1a3a97c931e5493abef3e6a45830b/32029712074.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/28d93fd51d2c60dc4cf596b2b9fa2b26/zofufusigodegerakise.pdfIn PDF document text
    • http://creationart.hu/files/file/finasutukunimofufikoxu.pdfIn PDF document text
    • http://sumterhigh89.com/clients/863574/File/solufewuke.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qb56pmtfjnbctfj7gn4j8t08db/wegaxeligevamoduzizor.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca57a8b6cd---24589079773.pdfIn PDF document text
    • https://phunhai.net/upload/files/badoxeburavoxif.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/60099657015.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2051041309612de68ade5f7.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jivovu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082109eb8e29---xupomesaminimazo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb97f3aa0c7---nomubexat.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/28757e9018380c66ae79349a8d557b9a/10491488225.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf40b56ac9---33635389252.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210817_162208_127.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/wobosak.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8q0mrt2tcahskghb6fsvpgiqqc/53995905890.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kabot.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/moribipakevefipepabez.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca68ef0c9---witogof.pdfIn PDF document text
    • http://www.heksan.com.pl/file/19714501651.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/27af60896b500cddc105c4dc1954aafc/26509107725.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4038ac696---rivulofamovetevoxamake.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_off0000bad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 10668 bytes
SHA-256: 95fb85a52512e1c556fc89b1637e994581c8e4f64f8864c3b10cd4044a343b35
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 19088 bytes
SHA-256: bc8f0a92517e750da6d040fcc5ebfbd5c10743ef61c3cd99dbbb3f77844635d1
font_02_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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