Malicious PDF — malware analysis report

Static analysis result for SHA-256 957a848ba5291508…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 18:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45dd9c7ac9fa16fea973c558702ecd98 SHA-1: f07e8c872c4a176a52a12e3e942cca5dc7bb7ffb SHA-256: 957a848ba529150839337d0cb9e5b1f38b8f10ed73ad76653b639f8b40bd1124
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, indicating it is designed to execute malicious code. Several heuristics point to the document being part of a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://birgatour.mn/js/ckfinder/userfiles/files/notisabapumiturefozij.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c76fa086f154dd5e2e401d41aaf422f9/lewumo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608978a47fc82---zamomikezoxogimum.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15380762527.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/toboguvaxadipoxesowoba.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bc9769911---zakozelukukigug.pdfIn PDF document text
    • http://status.cz/UserFiles/File/38713991060.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zaxezijifomudal.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce0543f7b---jefawavetova.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zupizeje.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/50ghoil0nb4s5b30iqe8ln75lv/70096926284.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/tolopebekudakorakoraxot.pdfIn PDF document text
    • https://luminex.pl/upload/file/laropuditujagopakedot.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/mopobepixinezidixazig.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/pavapikojami.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/05dbc8308eeabd98510c0fe22303891c/30769983177.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/582507d89b21c408a7213fc9e53c5a17/damemim.pdfIn PDF document text
    • https://koratspring.com/upload/file/20674967740.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/120dfb62e9d723fe6efa1370e932430d/69023923003.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/8042782336.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/32758695156.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/75064301594.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/kabafowu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/13707995749.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa561cb4d---relupezi.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6465ecb55---75623080490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=partes+del+estetoscopio+y+sus+funciones+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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 18804 bytes
SHA-256: 9bc6c7f6807d601bf14b75c18d0a3c3ec7d55265e525737ae59b1e7293fbf3bb
font_01_sfnt_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 10828 bytes
SHA-256: b12ac1d33cf23711b4b0590f362934ed54d09492c2e63bdf643c58864ff7cc13

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