Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf092fa24942dac…

MALICIOUS

PDF

88.7 KB Created: 2021-08-15 15:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d36a942ef6fbcb5e0893098d791a852b SHA-1: 635dfcf223f32d0312f7dbd04ee47e64e647840d SHA-256: fdf092fa24942dac6a79f432a5e520b8997a3e57930ab2d8089b9b639b3b7cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of links, many of which point to compromised or disposable hosting domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://younewstoday.com/task/userimages/file/41296581730.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/9330cad7818cf21487973495e3098f3d/13411673504.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/91538728345.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d60fc2d990c7dfc155ab7cce5bdbe20b/46584604663.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/gikasuf.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/resigawe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fc73850fbfad9735624286105a95915/82668473868.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/wixinebawide.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e1eac7d6---54328433804.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2a5b1bf3---55144445376.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9qtc2444n5315uln051i8c83be/xugusomonabiwudum.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/nakasosebanaxusijali.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16096323506421---kanigekizatusepusito.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/tubexewosefed.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7d2f181c---37311526735.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/34672060372.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/24570169071.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607655064930a---2308848637.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb3e6263b---gowupes.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/37fb4eaabf6fced5e9983c5cbbbcdf7a/gebapeti.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mgci9dglksuuekafhdkfncmhqg/22729998572.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/66862412293.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be2485442---57700994071.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/80782748918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+4+phases+of+mitosis+in+the+correct+orderPDF 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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10912 bytes
SHA-256: 0bfbc97c58f9580a07306eb56cf2a79e5391439fe339906a3a0995d61336c7e4
font_01_sfnt_off00010d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 17668 bytes
SHA-256: cf99fd8cfed3da35682bcaee671b17a4aed849c25b77068b76c3920d10411dba