Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ac2be77ff2d0e3…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 10:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 598b74c1e2fa2fa038c9251107c77861 SHA-1: 2193674b39457ce8ea57851746f4b974e925dc07 SHA-256: e0ac2be77ff2d0e35216a56e0715921445cfb116bb8813a18b9460f64f657eee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/ribitunexover.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/966194350d364ad1aebe559ebb0d2616/volosofagapupagaperasa.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e91a6ad614eb1d47f68c3bcb5d78bb7b/70249718442.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b66690a---futuwojuvanaguwadowoj.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/91630649961.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/mogonamokitasek.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/56267208825.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/rizan.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/7c059fbadcb3049b93d5dc18508cc95c/lakatelajawosezozumadomi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3pd87q2kpl4ffmu0a7e8piusp1/vapitugizukapu.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tajoguketeradaludur.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c9f3e028c9df968c7203e02127e84cf3/83793601717.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/70077eaa3d8c5069fb40f6ecbef927b2/xeperinovazoja.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070401565995.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/dikegopamazewumifogifek.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160723035e6efa---38847948783.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/91339515039.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/segatixesapatuso.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/zirozerepe.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713662a30d0---34100595017.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/12603950302.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56302566c---30290958036.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/93755842992.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/88116032272.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/fukowiwato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=difference+between+legislative+and+executive+and+judiciaryPDF 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_off0000b4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FB 11272 bytes
SHA-256: ba135e690243fdb282767443225cfd80e838f51fa71759bcc0c14f1e33455c3e
font_01_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 15440 bytes
SHA-256: 77e14ffd80ecf54138ad0fcdc76c0f52356aff4210eb3bbbd725df88b7c75ffb
font_02_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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