Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8d7788d84d3135…

MALICIOUS

PDF

84.9 KB Created: 2021-10-10 06:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 21fa79f4c649798f703a7f07de1c78d1 SHA-1: cfbb3cb67cb7ca65b46f84807bf3ea7895403402 SHA-256: 5a8d7788d84d3135d543286f90daa3408e9baadedc5d8f33689031ab56e95f04
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 PDF documents. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://open-call.fr/uploaded/files/lisugutuso.pdf In PDF document text
    • http://bdnchem.com/upload/files/vawaf.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/xoximumufikuvobetep.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/wejumazutasonalol.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16160b9645dabc---69546126168.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161483a38315c7---64406290052.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/67388183663.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/modave.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614765fb25335---3199605014.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/53580071762.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/xugipu.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/17488029239.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vujidexigepolebetedexixex.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/68286131332.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/nekogusukikinobup.pdfIn PDF document text
    • http://caythuocnam.org/images/files/fesenetoboseliwel.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7686cfa2---pazes.pdfIn PDF document text
    • https://kaimano.it/file/kukokozujupida.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210924105653_bxxla2.pdfIn PDF document text
    • http://corkpotters.com/images/funitixikegerewibadidad.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/goguludexotekejesoxuniwan.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/dovuporaw.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/nagadogolulojirilero.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/jejoxorowaxuzivunuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+talents+for+fire+mage+wowPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/mewikavewagoledaputo.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 10696 bytes
SHA-256: 16976266260090aeeb6ffc1a61baf4390f20951778675c9bfc2594b8344a89d7
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 18592 bytes
SHA-256: c5bafb40ec3f108f964203de084345bdf1da3c876545c5e971cab66723c70f64

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