Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5fe06b214c8878…

MALICIOUS

PDF

104.3 KB Created: 2021-08-01 01:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f71b2182c8d7ab4b3e9700c0c28ba4ee SHA-1: 3586fa78043f9f384b8d2e17357265a30a1d8596 SHA-256: cb5fe06b214c8878e6d72c1374d0617492d6a9157651690e9be00593f060ed4c
156 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 and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be associated with compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 http://lookkorea.net/userfiles/file/besiraparekuwapojebufi.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///2021714152319444.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/wuwurerevimemidodowike.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/356d0fe416bedae5d2b566d9130b51bd/72217425251.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed582cc4e4---wefutuz.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81344ff66---35355944702.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ql5bif13sv6svk0bhef1h7elu2/69768902195.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609f5a91d1---56097539836.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/52785005768.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e312ae43345---rimapupisepigibo.pdfIn PDF document text
    • http://dmkert.hu/files/file/kurokurabenibazepib.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/fagigudarusatisuva.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/58761609974.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/28514175181.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e1fa393711bfd6131d4e1604038fcc3b/97688794831.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/hn8bhojhqoggcv1ld0rafhi692/88507204500.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/39588519053.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/pawagetegiline.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1f5df329cef1d9bc713fa59f4d422640/biwerewi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b8a8d2e8beb9124fa4ce3129afc05d4e/77163531366.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac414f7e763---26840724121.pdfIn PDF document text
    • http://tornado69.com/clients/40643/File/mokizulesifepogox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+point+of+madame+bovaryPDF 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_off00012ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC1 19332 bytes
SHA-256: 18889061d014c97dc7bde53b1e1ae9cf979e16e6bcc636000b70bb5fa4c7ca87
font_01_sfnt_off00016023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16023 11028 bytes
SHA-256: d17df4b475b0748f5fe1f62ada95e5e55081f82850c3be83f8e7202e39c406ef
font_02_sfnt_off00017974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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