Malicious PDF — malware analysis report

Static analysis result for SHA-256 a489f7dc33897f93…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 11:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aa017b3b909e8b0a797af4a919d8aa8 SHA-1: 40e50b8902699937932deda38f8d4cab27622bb6 SHA-256: a489f7dc33897f93411547525398838c7e9cd3594c1bf75e9cf868effdba5030
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crysiq.ru/uplcv?utm_term=how+do+i+project+my+phone+onto+my+tv PDF link annotation
    • http://ttmplus.com/userfiles/files/14216619228.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/mozuvefavomotokenilo.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/64576829276.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/71443740866.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/79076357785.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/rezafaxew.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/92059005904.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/rizoxatow.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/gixukerubuf.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/lileluda.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412ab7ce03a---76606939890.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/73462085677.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/pagunadimipexesabavoboli.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddbbf7333f---82329912789.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136e7880a4dd---rorupe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8c1f0715---87193978167.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/31080441271.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75cb4421f---mepozazixu.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631933989.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kakunimej.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/mudikemowawibe.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/11599428339.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/wanujumeregalenazis.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/35721016674.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/34769540877.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/nibabuladarojafan.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/nijogavogujukuz.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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 17644 bytes
SHA-256: 92bdb8c39d8197b63c98c24132a354bf06e117addd74e3559eefc698675ae2ea
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10792 bytes
SHA-256: b5240852ec194bdd4482ca9090c7b65e24bb64e68bcabb08345d12b3b3c3cbd0
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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