Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a8e2b355da94dd…

MALICIOUS

PDF

81.1 KB Created: 2021-07-31 16:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20e30254c0760878a602e3966aa17e2d SHA-1: 6f416c68ec2d161588689ff719084c32da2c32a4 SHA-256: 69a8e2b355da94ddc23e965bd001c74825de2d4d3a2bf3446ca3f9d67079e33b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs to execute code. The PDF also contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ketchas.ru/uplcv?utm_term=advanced+cardiac+life+support+pdf PDF link annotation
    • http://nagakuratrading.com/js/upload/files/zijozezosowis.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jotup.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d068dfd41c5fe9242a659baf099afccb/weweloxujaduvaz.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/valasimuwax.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ktasrpribv7g4effjsbhnueh3m/bufaroroluket.pdfIn PDF document text
    • http://laduses.nl/image/file/56776682587.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160880337a7e2f---35445853201.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16102cc52a0d4e---duxap.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/3a6334c194943c099d3c6caab7587d94/neviko.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/dejogibilozonifazus.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/gofemilu.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/dewidukagib.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8f4ecdf62df1ec8b24619b99725932ee/puvoketeviwawur.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jinive.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/bilowilanagilusemazil.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/ribodimoxi.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/42878483852.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160816bd74e591---jenokavawa.pdfIn PDF document text
    • http://beiks.info/public/file/9129897429.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fixuwepogevipubago.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/muxus.pdfIn PDF document text
    • http://tulga.ru/editor/files/79667089270.pdfIn PDF document text
    • http://wp-kancelaria.com/userfiles/file/relogiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56770cf7b---xazosoxo.pdfIn PDF document text
    • https://asi-filter.pl/files/file/natitiw.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 16332 bytes
SHA-256: 2e3175a0dbe5457b0594560e312c74e57f8748fa52aab555582298304892f0c0
font_01_sfnt_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 10760 bytes
SHA-256: ac569bf24805acb6df48b7ce252e1e91139d5b1c133a5049d8dcb8815d53f7d1

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