Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff64eeab3a754f7f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 00:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2498114dfb7079803479b33e54315d6 SHA-1: 998b61cd4c705aece296e890219b17a9e0c28163 SHA-256: ff64eeab3a754f7f98e747ef6d067f4f2cf7350dac6b86565dae28466c2f972a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is identified as a link farm, with several heuristics pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The file's structure and the nature of the URLs suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=goat+simulator+online+free PDF link annotation
    • http://zamgph.com/uploads/file/031958495231.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/nobixovoxibaribuneteverud.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907063107.pdfIn PDF document text
    • https://funbugs.ie/files/file/63110777787.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-9/20210909100537299619.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210917_105031.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/85578229287.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///guforal.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/sepevevaxurafozovopusevi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021918519126681.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/77988879195.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sodididawaxuw.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55504489386.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/77997402862.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39175590542.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gabilej.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/voweziku.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/42471838165.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/woziwa.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rekofifusalutasufonot.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c100bccedc---5484167735.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mamunujazigeji.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/kuboxavuxuk.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a02e5cf7---14995924044.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0a2dc37f---jawonegitobipe.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_off0000d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 10512 bytes
SHA-256: 50ceaebcf8e22fefffaea4d86643fc409efe7ea5edfdb6ed7dcd472fe169354e
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 17864 bytes
SHA-256: f97a9379d20b43b12e00be18a8dfd179485210c97337daab2608b33e08b2abc7
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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