Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0603aea3c75f031…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 13:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f0659a04159a05f4d98365d4111f5c7 SHA-1: 97cb9064703323b70e32ca5cf597cd0d15aac578 SHA-256: e0603aea3c75f031773be9ea8cc2ed76e5ab9f2e91465d720fc32f716fc9c968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://ketchas.ru/uplcv?utm_term=emergency+first+response+participant+manual+pdf PDF link annotation
    • https://tonmathunglan.vn/upload/files/62271821975.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dikesesojowiso.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fb9e5e5693aa4ae17d4c36aef2d4b299/nutuwigomawidovog.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/36683836853.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kosamunisanosetegozi.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mofidovijapedafobedaxud.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061813035620.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/47394927341.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f0b8d8eb---dorimosamiwalob.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/tenapikixafozopaxiteto.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/31308512102.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/43376409764.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f10aa889e220d6eec837e7b63cc8e89d/93701720991.pdfIn PDF document text
    • http://51www.org/uploadfile/file/80156c459cb3d8d159df85bc49d2e03e.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80244439c---10987521335.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/26349730498.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/gudefijarepuz.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/tumito.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/dotorogagupagiwopajedibi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zegajot.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/90315156630.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb6414793e---diwoliw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/21709774460.pdfIn PDF document text
    • http://3asoft.vn/img/files/tepamagebubat.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/d4u9s9rncfr00udjvaohknbvpk/binimenapofo.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_off0000b942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 16156 bytes
SHA-256: 511741c5b5d493946b1d6568b575b9701239ce5de6c32c6bb143e88440f075dc
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 11160 bytes
SHA-256: bc3f215f4aad53c61e28c2e6a6d71fb54796951c476661540b0328ea07d7c5c7

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