Malicious PDF — malware analysis report

Static analysis result for SHA-256 556d02bd2e427149…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 02:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3283ea511161c6ba7e746a567544d144 SHA-1: ece35b8f1c5a56d599324f9d60680733829a42ae SHA-256: 556d02bd2e427149bda4be785b61f549282e668e504e483660542d1c7eb8dfde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users through these links, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=romane+politiste+pdf+gratis PDF link annotation
    • https://cornerstonelaw.eu/userfiles//file/givajamuziwejirefunem.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/wejato.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/458j6lr9ihru7mrsph68dkbu7a/48632800683.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/21838640752.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a64dd29d30e---97467073705.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/bapifofeguzoxulewil.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/vejawanofosofisoto.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/cjv2cog4lt528u5cpigb6ahbd3/palogudewi.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8621fc009b3084266d5266d44da17ff5/16401533755.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/sazokutiz.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/62952208432.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/85647504096.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ada0b0f8---8695680421.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lanosaxowikat.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/5337f942cf31ccdf3f8b41386ea76ba2/fuvejevomizajugonoge.pdfIn PDF document text
    • http://polkovnik.su/upload/file/46411151224.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/laxoja.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/79424750870.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162343172733.pdfIn PDF document text
    • https://diphong.com/uploads/jamoxefimexekeka.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/godigarupavokazemofipudij.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/25088167075.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079276a85671---68988398149.pdfIn PDF document text
    • http://jouezadomicile.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vurujakinoxuworilidef.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/35766785585.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7d62473---36709198795.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_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 10884 bytes
SHA-256: fb25a5954005005aea96009e4d076cf052395642fd56916d73a7cfa0ca5086e1
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 17352 bytes
SHA-256: e73c887d2040618f808c80f2ed1ad4793ea5363f7c547a64522cad7be88bc596
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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