Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cee7e1c202c4ba…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 00:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c1b6dfc8b8297c4b4087e6e258308a5 SHA-1: 640d9fbbcf4339c0fcba784ee62947327b9b6d58 SHA-256: f3cee7e1c202c4ba91c536f3622fc4f1ebd42f58f6b019bfa36727b69b0de3f7
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common vector for malicious activity. It also exhibits characteristics of a link farm, pointing to multiple external URLs, some hosted on compromised WordPress sites. The presence of a 'Fake CAPTCHA' heuristic strongly suggests a social engineering attempt to deceive the user into performing an action that would lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=pokemon+let%27s+go+pikachu+apk+game+download PDF link annotation
    • http://apsencollege.org/test/fckeditor/file/tejirobejofijap.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/lasonuguzubipol.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/fiwonebizixoba.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/11667270449.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/53635941261.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/89954008296.pdfIn PDF document text
    • https://anfauglir.com/images/file/katatenirevadutibim.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ccac4d55c59375b35ce16db4cfa1cc73/72076611209.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/dadenuseruvopubofupamol.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fimufageti.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6385d970489a79b66c05677725c5ada5/fixadomoxadudulosos.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39580237369.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/47194488379.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/20445221484.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/59007021903.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1899sish8g2080jh6j80n79ekb/gejez.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/48481533585.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/60190577480.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/vemesuvogusazupeze.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/74636922370.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/80587288343.pdfIn PDF document text
    • http://billsky.ee/files/file/xisizolivuvemuberudexu.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/58523880491.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_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 18560 bytes
SHA-256: fbe11c6209fb81be3c834a53a21f3169fda79f5c69ffb50fe584336ed864d6da
font_01_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 11172 bytes
SHA-256: 568d62792818d7030e6af1ea56d96dbbf0159e530e95c24fd0ecf57a2ac8c7ae
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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