Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3db250fa0d3e3a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 02:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c1975ea4ed2c8830e162e7a38700a49 SHA-1: 62b63ddd0dd3790c7a5f141b249a007163a0a368 SHA-256: 6d3db250fa0d3e3a58534e8bd25b8efa770a2c142ecd539b1da4ddd754331b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=stop+online+dating+roblox+id PDF link annotation
    • https://valubil.com/public/uploads/cms_file/cms_files/34149897533.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/surajakarofigupinuvitizof.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/pisagiwujopimajifoboruja.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/97967678594.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/78172707636.pdfIn PDF document text
    • http://hijoin.hu/editor_up/dukepix.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fekigidabom.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/7101733865.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/megiwemizuxovew.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/wapazub.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/54088345648.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/bekexejotenirujo.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/87975775776.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jiwopugurefixobanimepog.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/kowovotawunex.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/57df4f9aca0c088decbdf7a7fc08c47b/27017149665.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d4659bb4---gibomijagilipatinokuli.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/50081892854.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/30973450786.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/dixujilatalogi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a34ccb331---33139427787.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358be46104a---babekiluvukosibedaxep.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614021cf76d1d---89962366056.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gopafekilewale.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_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10716 bytes
SHA-256: 08c6a63b1aa23ed19c9632703a81508faa75474619df588cf5cd0700d54af61f
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 18532 bytes
SHA-256: 0c2b0399849c195f820ff0cd96f9477c926c9a0bada460b1a7ce1bb09f362bd2
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1