Malicious PDF — malware analysis report

Static analysis result for SHA-256 946e51f3dd6c020f…

MALICIOUS

PDF

89.2 KB Created: 2021-08-15 08:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3bf41e2edd09e97495e9be40171fecd SHA-1: 87a745665d526e96bd9b2c959b42b23c996484b4 SHA-256: 946e51f3dd6c020fe6d58f6363c953bfa339038b3a7dabd3625b9a63f07c74fc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to deceive the user into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4f8d6ba7515f5e370415a9c3ce9f214b/doxejoxapunogiboraneremun.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/dubunuxadisilubo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607669ed94181---25162056631.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de564a9efd0---lamegakalovazuz.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/53377496122.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b46ad8af7e06db1413b4aab6ac098977/9689861041.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217594741183.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/pitiwitinu.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/wopet.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/79086841632.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/wijegimirizotel.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/30936963199.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/33140877314.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111987b2b72e---fomunupiwevavose.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/69540151571.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/232102258107.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/90419606736.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/1731253461.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/99865305947.pdfIn PDF document text
    • http://babamoleskine.com/files/file/95651375454.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e50747793f9---xoriw.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aec161abd13---fejopasamiximojon.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/14307778537.pdfIn PDF document text
    • http://demkapi.com/resimler/files/lofotomubonemo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/sunemolaso.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072dec776de0---wolufagegurasutufexeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=qual+e+a+18+letra+do+alfabeto+charadaPDF 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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10768 bytes
SHA-256: 6cea91ed496e957246dc62ac6edaaf5c3b20d58fb626498dd3ab8cb47b4098d9
font_01_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 19052 bytes
SHA-256: 9dc4a90eb0bc5d4a8ef8fce9f21a8a637dc038fae22abe7a2f130423d7381748
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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