Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58a7a54507bda61…

MALICIOUS

PDF

200.0 KB Created: 2021-08-02 10:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0926c72be8c4ecd609bed7b90bbe710b SHA-1: 06d66e397ecd112cb9c3b883a02ebb87e011fefe SHA-256: e58a7a54507bda6100e98138b27036d0b4637307cf2a0a98b89c50950e33dcad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, many pointing to compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

Heuristics 5

  • 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.
  • 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://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b423b547ed7ea2ec33a5db09ea23c19/levinelizinejupudisoripe.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7808c4189---13591302657.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/23502468810.pdfIn PDF document text
    • http://ekotronic.eu/files/file/luvebu.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/68399513322.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/lebinilemewonop.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/5146558514.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/vumuvepu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/aecbaac571637b7cc459d6f8c4b6f5ac/puzuf.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/guvijesojanejakesofetajab.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gfknmlu4pnd282aolso069pftg/6984194518.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t65183iamtndoh9th01e4qe2lo/46304717336.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f5d49ad28880ea9f91b8836ec72e9fc/69811274323.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcb9cb095d---54883908657.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/wubevogeputovor.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wigawom.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b26985402---34960303068.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b95baa327b9---xibupigedowig.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/20887934544.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/levibaxaf.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e19aed77f---bopamodo.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/xobisuzurilin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc98e36ed---zexedubulevemolabimadozib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=7+days+to+die+mods+alpha+19+deutschPDF 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_off0002adce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADCE 18184 bytes
SHA-256: d702548826bacb6457574aaa761b033c46f6540788ef58ea320cbf6038587052
font_01_sfnt_off0002de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F617 10960 bytes
SHA-256: 39511e6d0cdc20f22768648d2e3e93e16835a43c0d0f189479fcc42b0ed1548b