Malicious PDF — malware analysis report

Static analysis result for SHA-256 342f6a538691607f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ddd44b6163a195f2bf26cf1e6681594 SHA-1: 9bfef36414aace093b22713f014c2b4af5ff9c8a SHA-256: 342f6a538691607f5f75db381ff6ad891e892b81c99e11fdc1e5194162667e92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URLs, including links to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=gomovies123+bollywood+movies PDF link annotation
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/61345691641.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/mivikoxebadumada.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/fuwusevufonumekuvumag.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c29fe5eb0---4797347450.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kagoxidukimuzelosez.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/zefekedilo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5a41896b---90470843598.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/zofezumofilutozasotiv.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sepefo.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/13977105395.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319e43d0d43---rejamowoxinudowemeluzo.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/48926130318.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/potobotukamukixevutivej.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/49244745053.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/nozedapefi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/filoxuvegofizebagiwuwud.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/gamavad.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914150419_97731294.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/zezawawilawonugi.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/63177585585.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79467913154.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/21809107578.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/39993778503.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/80724137453.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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 10732 bytes
SHA-256: e2112150e7b9f13b562d8f3e0ce45786e5c0d520f120e4f8e819cd3712487d3b
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 17232 bytes
SHA-256: 199397d88969164e2ea0e34a6ef79595da15c7f9792d273b1082d0892d61eb68

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