Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3f6c9b3c23b679…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 07:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c87bf666bf73ff111cabb78295a8fc3e SHA-1: cee6bb7f2b316e6f387f9eb355a36780882628d7 SHA-256: cf3f6c9b3c23b679a363919960143546651a4ee0a8495b3919a1bdd10bf2f355
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating a malicious intent to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics strongly suggest this is a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28059b9a1---soduxugazax.pdf
    • http://geotersrl.it/file/somofuwupaxeralejepike.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba67cfd7b---tenosu.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f3726395---revutowotilawojasike.pdf
    • http://absolutelyneon.com/userfiles/file/16438294761.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/ae283b7db58c28ff31ecec8b71dbab64/gutufopaduwajurolajanotir.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/xugukulifateletagokonupi.pdf
    • http://j-line.ca/fck_upload/file/bewaxivoragejo.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c4e0a44ad5b9f000f7a98f5d1679b694/47176711260.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be211ea285---zosolazetukago.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39de080f06---misemupik.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c7954c7b---63147748136.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/57122a9022392fad5c56dc1e1dd0a1e9/ramitezumipisimufavoz.pdf
    • https://akemi.ro/hirek/file/96549538396.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881da7276f5---munagupozazevuzuzorixo.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab271d1a11---pozadipotuzorivutoku.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607449d7065de---78612504862.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/33932465180.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/80948678130.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c632cc5d---45580082466.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a9b784d7---bonesapunuritowuso.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/56f7138f1f38f1b4c0d3ee574740b89e/zemadofomidimenito.pdf
    • http://sarljarry.fr/userfiles/file/45206786918.pdf
    • https://mariellatriolo.it/public/file/37861711673.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/tuxajoti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gizmos+potential+energy+on+shelves
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceaf.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 16092 bytes
font_01_sfnt_off0000e3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 16792 bytes
font_02_sfnt_off0000fc06.bin
798dbdc11d64214510f12b40ab47ce14f9b95f0fa06ce9a3fd357f5a89ee21cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 17192 bytes
font_03_sfnt_off00012903.bin
7c91ede7de1c3028607741696f141b7436df97d2e1e3a3307dc3c33d83a28d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 10976 bytes

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