Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42142236ebbbdb3…

MALICIOUS

PDF

85.9 KB Created: 2021-06-29 02:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82667e5022369b63e342efb9d1c8a14d SHA-1: d83d9ed86559a709e9e42408fed5a1db1de9467d SHA-256: e42142236ebbbdb3eceb259648f1fe89daa7ad33cbaeb01f164a046cc662ac8d
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic rules confirm its nature as a link farm. The primary purpose appears to be directing users to potentially malicious or unwanted content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=statistics+answers+online+free PDF link annotation
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc6993ff7---55970358671.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6331195f7---71940857966.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/254bdaf900a2c342966e63131b211798/kekefumiwawug.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6e9ea8a0---vegolises.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/64190706949.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/2371187495.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nuxuvetironetapom.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/majir.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/bedojizif.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zurizonifibuworofi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e156a050---devalanovalaga.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lfafc1t56s2be4ovic3m1khdu6/92866778216.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/72598110388.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/15858779373.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ed3415380dce762250317a7d321f4204/dogitaf.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/275a99c7dc31b9645d132790751cb873/luzasimipe.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/rimazo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/96207996fd8d087848a1a332e0d93c27/vexevojubo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a669c4dee2---poximunisavuxewema.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fofetepavidiwonumemem.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/r8tc2nholfl8c0mhajpr4jpe95/9983989409.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/663e235acfeead8792971594c5498dbf/noxafije.pdfIn PDF document text
    • http://peak-experience-japan.com/44695568832.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ba04bf9920ea3d7b95a23c0f823f3e4/misevowuzasezoxag.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e92fe454c---80941197881.pdfIn 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://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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 10488 bytes
SHA-256: 960e194cbf9500f3fb7686137cf3b6f02ffac549b317854dbcbe6ea7573c5806
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 18428 bytes
SHA-256: 14dd7aa6c09d8085a23b4854f88cfd4354990c71e8c0fd0ac355a322d341a4f0
font_02_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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