Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c8119cd08379a5…

MALICIOUS

PDF

378.7 KB Created: 2021-09-01 05:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4bc76f4900d36e8b2f5a7a6b7fec085 SHA-1: 8ddeee65d46330c22ef3e9d34141e1b47412b2e2 SHA-256: c5c8119cd08379a5ff95a7a69590519e8a646446fa427e19471e78ebd94f7947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8449

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 http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a72a8316f77---80537698900.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3db5c8acc569861fb2bc450329adb67d/wixemexijimimewalugibixaf.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/fab6966184f5a66bf60f167a509cc84f/19316559793.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/65039221976.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/napuwipevexutawovu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0265accc99c9a6e21d7b0e8dbaa63013/93332551834.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/4k1eskvrn65kb0slt0egvrpapm/valomivaxujolisenadexepe.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/655cdc2f55a9585c9243b9b8105020d7/fekotakiteme.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f99b68eedf2867a4158a5267c53289ee/wunubejugowiwavajoregak.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/pemalujasatuvigenabexawob.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/welumumatijotikeguxip.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/43267074544.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaef02484d6---18893045628.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wabudutu.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/76074155677.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/65810347111.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b340fa55934---97045071247.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/sasafis.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/kajanivejid.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/narejumugofeka.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/xodum.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c430dd44---58863946409.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/99030724964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=brand+support+masteriesPDF 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_off000576bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x576BC 10660 bytes
SHA-256: 6c5513e1586e34c22cd27a5e440681dc992571baa1303549d6da389b99d519d2
font_01_sfnt_off00058f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58F23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0005a73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A73C 19472 bytes
SHA-256: e62542c996f048d3d259e5c1d42b6bf12495fc22949990e26b9e2b7ce92d512c