Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e956c8d6c90993…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 10:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 918a24b1ed60af67fc13cb345241ca09 SHA-1: 74e61b23fe1c503aa9b9f807508a62098bfbaccd SHA-256: a5e956c8d6c9099344f0cf3233594a90be99732ba3e9e343b322f8e657fc5130
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an intent to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fta45117bv0i08de3ljkeidcdu/zezimebonexomivijeviris.pdf In PDF document text
    • https://shopinhome.com/ci/userfiles/files/dakorev.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/saguwi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a085806f33f---pajebizodugabokoliko.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9869372a4f---jezepejiganununewimoze.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/5e37abe83ba1b267c12675924b7a0d3b/65828284899.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/febilokarumazigum.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f91c2521---nepokaxu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/89844665a51880f592b85b9be7177279/tosawivubujemojij.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/wefakepetotafex.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ed01099d4419fda0ebad7be5adb8399/lirabetetiginenazuvafu.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/92367569582.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/48449335269.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6d380066e---dukarufozede.pdfIn PDF document text
    • http://mldinsaat.com/image/files/76513037469.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b6458b838c4dff577e13f9db00cf7a0f/48531955213.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79320cbfa7---kofavizaruxowijakuratuj.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60559d11b---34490251047.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/44777325625.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/s52fgfi8upo50os7bkptvo9ns0/75056046751.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbd4dd086---pezupodaxotamuketogo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160832db72ddd8---85584267004.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/26917176617.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df27d7c11d---74881840126.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075781a28103---27122364225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=h2o+is+covalent+or+ionicPDF 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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 10400 bytes
SHA-256: 56aaf16e28dc222a9d80f0cf0895ef409f48c244ba3f85b9f59322b10863772e
font_02_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 16816 bytes
SHA-256: 951a8098ce27245d6e915aa5dd72aa722b92fbfe2b90e101e4259700dd9f9dfd

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