Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4a27f2b1a03398…

MALICIOUS

PDF

88.8 KB Created: 2021-09-21 02:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9044771b340bb6ba2a400c7ba5e8c3c SHA-1: 81dbaef01e384918ebd30869df9c9313f186cf77 SHA-256: 9d4a27f2b1a033987e62a0287ec1b1103abb369477379b42656c313c6d517356
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs, some pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The 'Fake CAPTCHA' heuristic indicates the document's primary goal is to deceive the user into performing an action that would likely lead to further compromise. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=streaming+film+2021 PDF link annotation
    • http://ytovietnam.net/ckfinder/userfiles/files/18839660986.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/juzutijukupesoxagi.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/duvomederi.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62255353135.pdfIn PDF document text
    • http://gapp.fr/medias/files/82052059576.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/55607794432.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/80691355140.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/jipuxoturimegojid.pdfIn PDF document text
    • https://turbooto.vn/upload/files/zapopiminubi.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/bolataxugo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/45117068323.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/30465730465.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83587613943.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/7588677211.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/zuxuzu.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/tazosizadugimoboraxakis.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/41667806419.pdfIn PDF document text
    • http://zl369.net/userfiles/file/72517768515.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/10284571417.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22f2c2a0a---wunixodimaniporol.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/7495333402.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abe456bcf3---69516908451.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/95240295741.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f8971537eecbb9e109a51f0948e5801a/72385342165.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/52037794828.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_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10640 bytes
SHA-256: a94a32bcdea63e60ac6a8972a5ad4c23dec903a57620eef4ffbecbb8d7a7c19c
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 19604 bytes
SHA-256: ed57b015c7883372e364559bd1db920c1ae9d1b9ea556caaa451955c303e9c0b

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