Malicious PDF — malware analysis report

Static analysis result for SHA-256 19666b1d6f7a97b2…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 5e8c7be0ff1b0ba4340b47e6dac51511 SHA-1: 1d047abd7bc77a8cc2d99a9bb3cf37ce2f8fc05b SHA-256: 19666b1d6f7a97b2373aa5dcab2ed8cc34a5636634702149d3e02a56b4d23fad
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and a large number of external URIs. The heuristics indicate that the PDF acts as a link farm, with many links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.2340

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.
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=toefl+itp+practice+tests+volume+2+free+download PDF link annotation
    • https://pikhospital.com/ck_uploads/uploads/files/78315590467.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b96318f6d8---joloxiwemasijotizab.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/zurajapuwufa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9h697q60pd25vdukd88fgc2h10/sumedabolig.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/87456951975.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d09f70265---jivoladugomo.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/39694009179.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/80952450599.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/xalirudigumotenazu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353f94a11a2---91677056608.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd8055764---vozewudusa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132160fb7284---vefitegedigavutalokunos.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/4771721052.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/75846669873.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/kkd3piac057s28vua99ai9rjkm/61329577983.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/68768896123.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/gavadezelo.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/6458453997.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a7b7b00250906443a1bbf9e21fa9069c/rabitomonilegonipu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f95b1c739---totamafogerafuzub.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/39815658357.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/misimafumetusegude.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/53499386491.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/483636b0daa57425b13026785cb315e6/84101128901.pdfIn PDF document text
    • http://cwesp.biz/upload/file/65015234761.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nusokojoxovosilitek.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848ae6cad0---tolajivodura.pdfIn 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_off0000c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A4 17640 bytes
SHA-256: 22a472ca97e75de19484ad207b69f0c9fe93368564868d0b65eca1cdbbaaafad
font_01_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 11116 bytes
SHA-256: e32a49d85d4d254bb0b77cfbbe1ced1cf84c45ada520d9e39d6018010dcba998

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