Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f4e0edc25067dd…

MALICIOUS

PDF

124.8 KB Created: 2021-08-04 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bbfb36cdf8586e7488217c40af5f18d0 SHA-1: f7544a60eb8a7c3c76a3ea6b46f7ece49ed3d326 SHA-256: 18f4e0edc25067dd39e07c680bd129f7d9bb73f29aef47099ca0c2ccafae174d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a password-protected archive lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of these links and the archive lure heuristic strongly indicate a multi-stage attack where this PDF serves as the initial delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/cnhgjjj6fi3ir106s9binn369n/11194091994.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/rugusajoxaxibunitopid.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adb90a283fe---vugivefasenapubinos.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073624fb2c52---95701481000.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/46461884353.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/nerevomiwijaxato.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/94155611634.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jetokavifobuvixiza.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b69dead0.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/93182786552.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/21587484473.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819abe98e5f---suxubozokadojovom.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/suzekilazelepimev.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e8df130bca8829a2f86fd7b93fdf81b/nusafewuxofikiko.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/wipetefoxijivuguguj.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/xegerawefosos.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/boruvaxodelefebevugogum.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/jomubuxusepixuvutu.pdfIn PDF document text
    • http://innotack.com/userfiles/files/lumetijipavawomexuveba.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd28bc45d4---62409415886.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/mosexerekekim.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609590af106c9---26576171892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hallelujah+uke+tab+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_off00017fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000197b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B7 10464 bytes
SHA-256: 1206dc9331ae91cfc788d367302a0e3a556d14094b31eff9a256cfd97f9d1373
font_02_sfnt_off0001af53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF53 21232 bytes
SHA-256: a3be20ce192180259213fddd56c1a50c08010c195dadd172944946014be77dd0

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