Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ff8f663e18888d…

MALICIOUS

PDF

95.5 KB Created: 2021-06-26 06:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e3c9cacbe426ee651cad84b73dcc5b2c SHA-1: 83536f17185576145ee6bd2d0c2ad1d1104b27c7 SHA-256: 53ff8f663e18888d7085aefeddafda6cf1a2dd81e143886edb8768e174afa545
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pistant.ru/uplcv?utm_term=meaning+of+divination+in+the+bible PDF link annotation
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a937a0602920170a1eb27c50538c7a06/56371267855.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/84084980934.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/buvalaramabimekenumig.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aeebcbff3---50712348043.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16081131fb2115---75792860533.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jidepex.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/nexomugonodapo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/danovalusi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9ljneemj3vlfhn65050n3e5k3v/42095156874.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105031613373481.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/18507597934.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tirixozanujaloneda.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/71231262376.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/12688959036.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160865c80b908b---74294696082.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/d005a113e0164b6dc721ee10811a7a6c.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387c3a509c---fulesalanokidujipujimet.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac944e75cde---95157994007.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/qgr5b03l5u53epop49g66puofg/zutomux.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/47a1d2e0e802293587b2d508420028fc/85693968420.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/v09gg0tt5ij1c28g60ibkj55fn/66042003719.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5396b6302---bafidominorinefasufafed.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/fuvud.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810859e1f75---zamavumoruwawadax.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0f9hol4116ncm5f1ohtm46qs67/20844572795.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_off000115d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 16432 bytes
SHA-256: 6a981a36fd605a23c580de7b7655132ddf6102b4963179fb68fc3288cb250537
font_01_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 10564 bytes
SHA-256: f7dd1242c8483ff70997d71e3ebb64184ad26d027f8557785d79b69617ecd00e
font_02_sfnt_off00015850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1