Malicious PDF — malware analysis report

Static analysis result for SHA-256 89edfd2efe587eca…

MALICIOUS

PDF

83.1 KB Created: 2021-07-01 10:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e6358f126fd395358f52de61b1565cd SHA-1: e64168f742b2daafc3f703b31557be27c90f7a3b SHA-256: 89edfd2efe587eca80160be3ccf691d4750d8068fb1ec51ac54a000e0a79492f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6816ef4d751a339a31e5badb17c36d42/vumaxokesamafoseke.pdf
    • http://sharon-barron.com/userfiles/files/13680616193.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/792c2ed576b4a53229e27d38ecaa1a56/wizesixoxafabemivakivubu.pdf
    • http://nextgt.eu/uploads/file/85118860618.pdf
    • http://nfc.soo.jp/file/rimufo.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad60e5d5a0---gowexonozezujo.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3c78aa8e---basapiremibazo.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/5cm44ssif0qq03kloqd1gdu1si/pejomegewomu.pdf
    • https://mmagame.com/userfiles/file/37841140781.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2e15ea30---gutuvub.pdf
    • http://ekotronic.eu/files/file/vumif.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095dccd3dab9---gewuporofidoxa.pdf
    • http://sarlampa.ru/upload_picture/gepulifasolubi.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhg4n9pluef0umpaksaqmsu45i/nedorotimotuvos.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nb37d8smbt927uvc2q4ef2tdi5/73061156727.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1h7eibpokc79tu1abkgkl5m18g/sikivawi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160896e4943acf---82939953098.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8ba59174---xogowiv.pdf
    • http://someteme.com/archivos/_20210624040106.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9of5ni4cqpdgqgh3pip6ro4fv5/nuwemutiteke.pdf
    • http://studiolorenzino.eu/userfiles/files/81140172068.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+sea+vessels
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba08301a7e---39103351629.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ce.bin
6999146a9badb1b61c285b11e546e7dd79d31d4288c9db827f484e0bd4ee8e86
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 10100 bytes
font_01_sfnt_off0000fb8c.bin
0fdbc7fbc83a9b62c53efc7c014cc604277356aa7911aab06798811033b6f283
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 17196 bytes
font_02_sfnt_off00012785.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 16792 bytes