Malicious PDF — malware analysis report

Static analysis result for SHA-256 1babfba1f8c4bf25…

MALICIOUS

PDF

95.3 KB Created: 2021-06-27 02:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 531957101a96f0dd9e2b1335656cc8c5 SHA-1: 559de710cfda399aab75070d6c9e922c56b8faea SHA-256: 1babfba1f8c4bf250b6a9ee625d7a0f08c4b1eb8675ce22fa494eb959cae9da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of creating link farms on potentially disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/765dc67437bf430885587c10203497da/juberesuniwujuj.pdf
    • http://agcslohian.com/userfiles/file/ditumilozasowerog.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/978f347aaf08bab9893b5bbfc2d67b66/3088912451.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f77e0d2f415903673f020512db6a0fd5/9058006955.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/72817319437ad939bc30cf34d9eb946c/vexazusasupimuxezozape.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/39fcb0432e769617444e46ad1ecc4df4/jujedufadanutopafenafez.pdf
    • http://allasclub.com/campannas/file/56331851469.pdf
    • http://toshiteriyakiburien.com/uploads/files/sodurubididetore.pdf
    • http://zge-led.com/luodan/images/userfiles/file/37367760761.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fb39ec148bbadb893c83bc66ccf6ba7d/26462478669.pdf
    • https://kovosluzba-praha.cz/res/file/40947249119.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gmla4o2ljm0qu1081jjacah6e4/13466490169.pdf
    • http://amadpich.com/userfiles/file/2779560018.pdf
    • http://aliceinformaticasrl.com/user/pages/50360569224.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/36996535154.pdf
    • https://aashianarealty.com/file/fijaviwisijuvefobepinowe.pdf
    • https://arte-salon.ru/upload_picture/baxiremupusejimigo.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ddde8a4f---50330723206.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba20e8bef2---17506996392.pdf
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/wudunefinuvuwojadawu.pdf
    • http://tfforming.ru/d/files/libodekerarututix.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9293a85a---50448205275.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/zuvedatijuvafirifor.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb446ca47b9---sewotawoje.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579e0b8e42---55385690800.pdf
    • http://poltinka.ru/userfiles/file/21922916778.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wiped+out+meaning+in+telugu
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F14 16792 bytes
font_01_sfnt_off0001272b.bin
fa46e210c7568a1fd40d942eec234507d6a7796314bfa4c1ee0354223a531fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 10560 bytes
font_02_sfnt_off00013ef9.bin
672c7c6eded2d671fd64ceb87cbbc4f5cae63a79609fb621958cffb2147dc8b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF9 19076 bytes