Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebbeb5e5de7e1cd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 17:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41e495332bf051db3dfb7c83cf0080cc SHA-1: 754d7ac460479c7e6c9b9cad7bb2c41c6854dc31 SHA-256: 2ebbeb5e5de7e1cd9d1e9e755533ee00adc6864eac6cfac479e7ec73f40a8b77
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to direct users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially compromised, PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://renewone.de/files/rogaroxewalebogodas.pdf In PDF document text
    • http://swapnakoodu.com/fck_uploads/file/7838237456.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134c41d50076---logezele.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/47849572255.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/51867831368.pdfIn PDF document text
    • http://firegallery.ru/img/upload/bixoko.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/vofosimad.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/dojelemuzi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bba60d557234fa329b71811f7b843a7f/22054086566.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/buzakajafame.pdfIn PDF document text
    • https://sealskinz.ru/files/file/kifem.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/bemovopezigapubi.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tusatebikuzinifetesupope.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109162146163708.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/monila.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tekif.pdfIn PDF document text
    • http://matras-devison.com/upload/file/68853217210.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/golodidajimirodokudoxug.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ninupatulukumide.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/pipowerak.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/kunazej.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/859583fa9e19b1759e0d638287a21d7d/47132798581.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/bavinomot.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613421ba5093f---sikilitukedepijebegizanir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+move+app+to+sd+card+android+10PDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 19440 bytes
SHA-256: 79c1784971b4fc86f6f6524c7fc5a3258bcd01ae641fd7c7c549be892a16b7d8
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10944 bytes
SHA-256: 7200a532e8944cb91417138516145fa9d5a86af0f7fa0a341e8b31990271a8bf
font_02_sfnt_off0001273d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1