Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3e040a0c0caec9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 09:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4df231c1722c855ca8e4cf35a1bd007 SHA-1: 0913dc2da6a0e39a23d96108fd245ed98301acf5 SHA-256: bc3e040a0c0caec9c2c6c2cfd37a2793fbf5582372215976e4576cb948a89dbe
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.ville-dammarie.com/ckfinder/userfiles/files/56730597689.pdf In PDF document text
    • http://dragonspond.com/uploads/files/supawuxaxinoraberowoduko.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/70280539810.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/53228301142.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tibovunewuwuwax.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346dd5000bb---30206470614.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/2725504523.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/toginulebikagevep.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/36516832458.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a97a2fa05---47011335485.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/55135059162.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/35080482628.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zigexabom.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/93996819894.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2m4bf45oef3ifgrtmic8kf9k9k/49687200728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6a92e5090---wowavibitivebalira.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/xolisutubezini.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/xavudetoridizuwunorapemed.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sikofupuraxilesipipon.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/nijidisad.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a85be20---63376450174.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906025829.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/35281335997.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/4131771453.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/sowategaborolunopi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/ladubugutotoriwofaxarew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=campbell+walsh+urologia+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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 18560 bytes
SHA-256: bb20fad9eeda8e1a6721143a6daee126ec9fbb453f8ec357981afbdbc5f1da51
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 11100 bytes
SHA-256: 2195cd4d4de528f6992264bb64e00e703a95e81983c5b0816a19039493ce561a

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