Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b2e74f42c14262…

MALICIOUS

PDF

89.8 KB Created: 2021-06-11 16:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ea0fce2f9ddfb9873b08142e605a850 SHA-1: 4c6a0080e1865c59867599b98f875f579f4dec76 SHA-256: 65b2e74f42c142625c28c5ee8838f9cc677e1fde574124c0df8452c22af05d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ketchas.ru/uplcv?utm_term=injector+unlock+all+skin+ml PDF link annotation
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h2m9mnuekgn7fmqo0cmk0rlk9a/xerifobilumufaronopufos.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/batorirogupanojifor.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fe34cb7182363e91a54b88ba9c2f33f1/29751956222.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e026fef6c2---vuzikezebuwedo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ef4e15317c8bdfb16c998c2708c9db0/74745194773.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a07e42ed---81287479988.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34e73f970---sasavab.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021522628525707.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/576a2dd298eee68304a0e3c5842a50c9/savewutiri.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608299676a89e---bedipewi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0bc69b70---geluxakuv.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5da9c9e9---25980286459.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fodevegutojemozigenev.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d314bea6a1---daxekunowexozuxibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 4904 bytes
SHA-256: 411f5c6a731a14b63842152fedaabb6d5f9d3cf9cabd5a1880480652ed67088d
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 10424 bytes
SHA-256: 32e74686f6fd0b793ac793c6e5fdd1347a8c86cb3393be9732fd4bae6cc0bdbc
font_02_sfnt_off0001330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330A 17112 bytes
SHA-256: 436829979245b7126098886beec731c3e32f79caaa22165f5cf5bd484c81a714
font_03_sfnt_off00014b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e