Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce33bf91b5e74b21…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 06:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4008bf7e47a46886e83ffcb43b0ce5d8 SHA-1: a83e47e536eecff89d0c2ffdd59fd6295ba73cc4 SHA-256: ce33bf91b5e74b21d17561d8149b9e1f1953ebfe51f2d8d2af090112166f6ab7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting it is designed to lure users to malicious content. No scripts were extracted, but the structure indicates a link farm intended for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=destiny%27s+gift+story+pdf PDF link annotation
    • http://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdfIn PDF document text
    • https://windsbs.biz/files/file/vufimegesevisoguku.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/86378977507.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/46d238c68c2d38e0b45016210de2f555/3180069244.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019820f5af---kanixit.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607847d7e5744---zowulujufiloroxagexerolu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2e34ec9b68e8921d6e334f2e9433b5a2/vuwajimitedaw.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/54bff024318dc1e957de48efb3d6d9c0/28266082935.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/rikuzuxoripagerep.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/ligagaxumawenowirizog.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b42bf94---rijexaremeromupolujisux.pdfIn PDF document text
    • http://accronline.com/userfiles/file/49764400360.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/nemoderurarufim.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/rudujuxokasibew.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/07eb88a3a2c3c6e2dc0eb8047c63128f/15223008960.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/b2e16313469f8077cb106cf0103c1598/fufogagotedab.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/kumaloweguzawulo.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/danajuxezikasegulinive.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jarewugibog.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/44bd66f20eca76522fd2689b4e71457a/numuzirugotoxulexulunag.pdfIn PDF document text
    • http://yuha.be/_files/file/jefolamovugevokokimub.pdfIn PDF document text
    • https://telenovella-bg.com/files/kubusitajebiruguxepu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/66399285300.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a744742f9446dd08805b8117e285287/47908085940.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_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 10616 bytes
SHA-256: 142c643b05e82c456e58d5fbe5c90070ef1aa889989137c8d15b2701ea762a73
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 16944 bytes
SHA-256: c254de656e439f200f5c84b1ed5645524a694e152e7902c00eaed7a6b9dbffdd
font_02_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1