Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e21570ee3085c3c…

MALICIOUS

PDF

97.7 KB Created: 2021-06-30 06:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5a4ee2dda407dd41cdb0c462bc8d8376 SHA-1: 8e58be36e07ba4bb609f1f4c1fd4fb8b9f25172f SHA-256: 8e21570ee3085c3cd612dfec16519f8dbef41996044aa2e631d31d2bf9536905
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://crewmak.ru/uplcv?utm_term=piaget+substage+4 PDF link annotation
    • http://nusratali.com/userfiles/files/98042743654.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/rogusuzoruma.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/f9e1e9249676b338cc243c6e7ce9bfc5/xonerolalat.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a938b258546---35947249248.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/judmmkfsk0g7k8dbrctuc7a8pe/fikinonabovelamiwurirad.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9c340a912376706a3aeeeac1dab39bdc/burenulajumotab.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qtgfuaarclmkuqpla0qigrno0m/47011938600.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/texoduboxik.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/80610309891.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/19680643410.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fef145cd6b48b957e3935fdc37181ea2/36617218147.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210612003712.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27241748e---dapajutunezowoxuralesejek.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/75922486034.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/41710549857.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c141a5132---daxusamixamufixijegitosob.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/30b03ca64e5e58ffc16ab6bf0df2892b/34590151255.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5203ebf21a---datadazutorube.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fameruf.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7b37cfc9b6a138937bb0ffcd1f60e604/lojemikuzudojosiwax.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39954e094---61170295956.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5b6eccf884793ff58904760a51c90993/40140031283.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/dupijegafubor.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8875191382---18766368379.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/marurisafurowejabufavit.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3eada03cf---velowonar.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_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 17232 bytes
SHA-256: 421208be4394816799606029e5a7c87eadff5a189cd1c9597aa48e354756895e
font_01_sfnt_off00014a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16285 10232 bytes
SHA-256: 76f729a9daa0084f0591441e8cbdaee9de071a8cf8eb1db7727bf4ae7687abe0

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