Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5e90a60d092137…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 11:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79785b6fdb912ce7988c2aa987ceb01a SHA-1: 20979281181475846b7c94657d46d54c0183a258 SHA-256: 9e5e90a60d092137d1cdcd7c91e02cf6c8bf2b4d1d99508d8bb7483a3d2e7cb8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=roblox+robux+generator PDF link annotation
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/93932005532.pdfIn PDF document text
    • https://nexusmediation.nl/files/91760974165.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/24823626869.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/nudixutumugaguzibawasazaz.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/xijekijixajodupo.pdfIn PDF document text
    • http://msiutilities.biz/documents/lanedefebew.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/pupidigad.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/30416326510.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/83154663825.pdfIn PDF document text
    • https://shunnasato.com/zikodizavarobavegidoxa.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/23339505791.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/larasisabaso.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/jumorugisapus.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbdd49f59---libawabisixame.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/lamodenibumesarab.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/94618858354.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc394056b---10782097654.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/49982986419.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xofuxifek.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/52590038905.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/44105389176.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7004fc9137d41dd32b8ba64ce601d9d/5648141304.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3743866f9---wekazilawinopawevotesimev.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4fc50a5cd---45412584928.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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 10412 bytes
SHA-256: 2597e9cd019b12c97058aa6722d48006c5edd92bc5fe1a6d169acefd4bee2e95
font_02_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 15892 bytes
SHA-256: 94e9f259ee35ffea3fcb62c2de7c61fbb20c2c3babd7769dcd66ae0390761972

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