Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0988ec36521606…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 10:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 561c17f8b2de9012c9c5d228e39d680d SHA-1: 476c7692f89b28db5c37d31fcca11bf5d16889bc SHA-256: ef0988ec36521606d12f0abd595f849e6f2b9cfa75d8b580b564c544d924701d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=two+types+of+environment PDF link annotation
    • https://clearpatth.com/userfiles/file/litebuwoxet.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/woniba.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210902220001.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d86db8b6e---sevorulutotogiku.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nogojuvujok.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b09f33d779---kesev.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/47267824327.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56e852591---95303797887.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/sadabe.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/95135990285.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/kulizerubikisaxukubaf.pdfIn PDF document text
    • http://iknow.pl/files/file/sofupewukajudorajisut.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/zurabawarabutiwek.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109021722475062.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/91723911180.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/96674062943.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/72837803893.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jupedovole.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61015354616.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210926234552.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/tebadojarajijike.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_off0000afc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC3 10540 bytes
SHA-256: ad3de1eed7d707458a1d8122598a0a9ac2f495ee128acb2b3434cb080f1b1540
font_01_sfnt_off0000c7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 14896 bytes
SHA-256: ffbccb86653d11239ff6e0f638ad4fb1c8e2bd55a5b63817a2501dc3271d57ab