Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca5b75b5943a10e…

MALICIOUS

PDF

89.1 KB Created: 2021-09-15 12:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e482e97af4f59662861378ec27ae122 SHA-1: 3a4d72964bc669910fe0f8b1e814c51766221fdc SHA-256: 9ca5b75b5943a10ec03164422d32583d84d9a5e8c6eda191163113d2f78a2254
196 Risk Score

Malware Insights

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

The PDF contains a social-engineering lure prompting the user to install a browser extension or update, a common tactic for malware delivery. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a secondary payload via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=chrome+android+10 PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344b8649cd6---56376105178.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/99372065026.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/97271996898.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/tobanifuzafokizazinufegu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/85249080029.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa7a07ad1---11082308587.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/21363650124.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/giluvolezabesopivekego.pdfIn PDF document text
    • http://kag.fr/userfiles/file/56325334473.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/tovezanaxunuw.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/fizezelerepumimaxi.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/65782295425.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/83680402387.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/70297463957.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/60839921906.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/87672304853.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/97114877667.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/8772064575.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109081711154208.pdfIn PDF document text
    • https://heyratacademy.ir/file/rolozidi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/n0298f58qb4bsof5i9ed0c0q97/92467617522.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/38797895855.pdfIn PDF document text
    • http://pi-consulting.ch/download/fesitawupinep.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210906_073301.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161363bca80d80---64302951717.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 23532 bytes
SHA-256: fbaa6576159e7df882f1e59c7236849ead451e386dbf660ffb9317c87bec6fe9
font_02_sfnt_off00014003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14003 10408 bytes
SHA-256: 06703fb95f993e95d83f9af03e5e76620dc0a8be0a8fbbcb22b3cc07dfc210e1

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