Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c47057ca0eb5aa…

MALICIOUS

PDF

91.2 KB Created: 2021-09-22 20:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e481d490f8a6759bdc6064ba988ef89 SHA-1: 26c48de1bcc5665f9e5bdb5a1977949df59fbfe3 SHA-256: 85c47057ca0eb5aabb338912f55b8c17899a6ddd4077781ff6ace0d9d2373463
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://planningpvedh.nl/ckfinder/userfiles/files/vosawekigomodoxawakide.pdf In PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/56785991709.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/bunopokamaxeratadisimu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/96237171231.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/vitesemona.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/64581887799.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614982fd86426---28846445131.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5c62789227bdab1d7c4faf2c08a580eb/towupefuwofotelokeban.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/powopidezelapeninafira.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxawuketufodoliwameder.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8bc5988e60f26a57da29fc95b606f9ee/77100561115.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/30771263407.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/11587877803.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/rijukevutunulo.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/73519478417.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/rurolexizisedudokalasu.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/64799857771.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/98981258622.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/tulokosozidedawujis.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vefagenudezumezitov.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd6a4e786.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/zefixaxamudipalizobulev.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/kotivikugebuk.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sipopileloverofada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dimension+of+redmi+note+9PDF 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_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 10476 bytes
SHA-256: 5ed45a2fa69e44f44e81019c84aebd5f924d805e61251ea3e682d7d2daff4cf8
font_02_sfnt_off00012cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBE 19308 bytes
SHA-256: acbdcbcba06417a8c1aeb06aa1f790c380e3ac878774acb4f9d9cb7ff89d0b84