Malicious PDF — malware analysis report

Static analysis result for SHA-256 805dc76416847255…

MALICIOUS

PDF

89.3 KB Created: 2021-09-03 09:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2649a0d9d76dfa3b3e5c9da0f7fa681 SHA-1: ddfddeda394196819b84070e944022bd6a90ed94 SHA-256: 805dc7641684725589293d13a8b859db3c5faecd2ec6c05a7726a120afb20f1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://coretry.ru/uplcv?utm_term=geometry+pdf+answers PDF link annotation
    • http://hurtmar.pl/Upload/file/rivexejigejeso.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/255f00873747226f7fb901374c67959c/vegalewisavupiwab.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kegemelamapijil.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b041a1e6482cf05271f8c4a8243c2dab/zunefa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160db167850a45---bejukojelixarabe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8198363c---82596037105.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/37243012423.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/43030399625.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210723_30129B43854C6E70.pdfIn PDF document text
    • https://businesslife.com/content/file/xajafodumi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/50042127236.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/xekobufexibalebalos.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6c3b4ae7a2892946856fe8b83fad94e6/8971674756.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30948aa2fb06c57e1482882bc5af8ddb/49117127981.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb1118846---webovixolinejikidaravawor.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210626_065305.pdfIn PDF document text
    • https://kristinanamaste.eu/files/41851460588.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/fapijisojutekit.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7f3b19d40c57fdb88359cd32638cef7e/72148690906.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa3fe86b5---solanijumuzikutuk.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/86bb035f7a96c152d9fe1389e091b657/rejadumax.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c08a5546---rarumalesudoginip.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/81802645789.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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 18756 bytes
SHA-256: c77105318c8d8470c9b8f274573b277235bf876964a80f6ac94b9b07a00bb027
font_01_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10760 bytes
SHA-256: 0fdc115b38ace0d3af3024ca185bc412af192add8d9a3b6837538db9520bb2b0
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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