Malicious PDF — malware analysis report

Static analysis result for SHA-256 9631f4956798c42b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 09:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a585742543e6841d16c07a8f5d04650c SHA-1: 1e33d699e3012fed86ffc7a64357e965a3a07bed SHA-256: 9631f4956798c42b97eeb70e5bd8aa9b9e3609edb5965bda08ec1a211d2ae240
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage search engine optimization on disposable hosting for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://garglob.ru/uplcv?utm_term=how+can+we+get+uc+in+pubg PDF link annotation
    • https://gitedu.in/ckfinder/userfiles/files/bajuvusam.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/71682315746.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7rpm0cjsm41tf68qichnn29uk6/31239522838.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210920234850.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/93516194150.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/36859110442.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/tosuxetugijefisilapisanev.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/kafaluxavaxifi.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/telitotasaronijuw.pdfIn PDF document text
    • https://kimcert.com/E/file/18527700883.pdfIn PDF document text
    • http://jar-ted.pl/file/79328101020.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/75438674430.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/94280355181.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/bajamufebefovivarede.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/3513440768.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/88335847483.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/82953366019.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161368dfa55287---13395052876.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/kiwogij.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7c35c56e93396f8c7b4cfb5c03cb45fb/wotipigevosuje.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/65932958409.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/doxukigexig.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/sepiwopof.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210912114756_hs6s2y.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4636ce45e---62733692673.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613939aee240e---1401597915.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_off0000d2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CB 18108 bytes
SHA-256: 7b4627934f2566122d6bf88e0ca312ff229bd44aa61532acd88813aba237d5d1
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 10552 bytes
SHA-256: 76082fc509fedbf0745b363b529097ed91619f3e8b527420df8c948c519a8858
font_02_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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