Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc37de89617c8abc…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 19:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8c628f56443cdaf4164572cf35290eb SHA-1: 0413ced0f14c5f66f16854c47a3336f626ac23e2 SHA-256: cc37de89617c8abc0acb92787c64708f9f9679d91172ad18f91d181d8176df2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's intended to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://ebal.ro/app/webroot/files/userfiles/files/zalosubij.pdf In PDF document text
    • http://wccflooring.com/userfiles/files/zoloxajufibuxix.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8f4cab6e6c491886b1253fbdf8dbc594/junivikuruzilizukavevalu.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/87671375746.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/24051874697.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/78600997631.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8hebhur4svrmjr2ec66dm9qt43/likiwene.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e53fe2e9feb0b53eaf2a526561d4f580/52122980752.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210814130641.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/99359889575.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/38689490731.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/70023445381.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/fiduda.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607878842a9a0---rofojegeboveriwekawesew.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/tanilajaregov.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/gubawufujidoxexizuxesupa.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088046f30713---34831559524.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072053032986---rozumusosalupo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27852106b7---ragelo.pdfIn PDF document text
    • http://a-pluset.com/userfiles/19285708971.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/mukarov.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021080820490773499.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/89226708462.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/83856395127.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7dfbad0e8c4a772aebe9a9b694b6254b/93025068620.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840780deee9---31725624697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=structural+design+and+drawing+by+krishna+rajuPDF 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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 17188 bytes
SHA-256: 7dd0fb4e7b80d8b06304fe4aa8b73dace9a59e5b785e309da244dc4f8b4572f8
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 11264 bytes
SHA-256: ea106bba69b92ebeaaf76366d2723e0ceafd2bedb2f151ef416939d1c5d7486c

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