Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0af1fb0d8943ab…

MALICIOUS

PDF

83.2 KB Created: 2021-10-17 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e8519d9f029e384deb6113d51f96889 SHA-1: f0c4fc037c47138b5d469114bd99ec72f2f2ba58 SHA-256: 6e0af1fb0d8943abf68602659ec338dddc7c20a408e425a891855d9989dd609e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns point towards a spearphishing attachment used to lure victims into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://privateeducation.sg/verzsape/demo/upload/admin/files/tevajiv.pdf In PDF document text
    • http://starinviter.com/ckimagefiles/judikalobifetuxavetupa.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/xarajug.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xatisarewajojorarexabep.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/66932963876.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/kigoredegadafanavu.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sifiropagilaw.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/11906618088.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/teluregotuxaroromaveta.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/38100165084.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908225149406520.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/60262252743.pdfIn PDF document text
    • https://sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16167e980d493e---19059501901.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc9f9415b8d1a19482a8055fbbc6282b/77955410979.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/abe8e40289343302df822319b9ea750d/fotiwizanasitetiga.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/16524771958.pdfIn PDF document text
    • http://japhina.com/upload/file/robatowovu.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/susanebudonaxusodopev.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/35331862530.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151c1d62b9ef---dofegezakagidaf.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/pugezanadokivuv.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b15a3963c6---23016664637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=astable+multivibrator+ic+555PDF 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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10708 bytes
SHA-256: 48732a4b59482709fbc4a2baef39e44010220fe14f87f395996e862952f679c2
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 19244 bytes
SHA-256: 5925bc441a49404cf05d01f4bac6315ef6fc4f51a5dfd62147b9c589b9ef558e
font_02_sfnt_off00012755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1