Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a7a5eced93d04…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 01:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2709e5b22b1c79031030a749d8f60a2 SHA-1: 2594741c34b494e764c8d397a7d600e25863db81 SHA-256: f26a7a5eced93d0448e475a68ec178666dc597ebab59c36b875d93ce9bf0016d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/63074939352.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0f0451d5cb58592290f8e6cdbee9b87c/7491567608.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210907025103.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fovuvulatozoteralive.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rusovim.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff560ddb98---99166955175.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/gaseguwanupoxuveg.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vejonovaz.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/pojotufulibo.pdfIn PDF document text
    • https://patc.fr/imagesfile/tabezodafara.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/48695490714.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/13126819921.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/45819052494.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f70150b3825cc11ae0063f5d9716ebdc/gonomawovesiz.pdfIn PDF document text
    • https://istanajp.com/contents/files/legijuvewuramedal.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/4385187003.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e1e24d7e7---lijakuligiseku.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/kejefota.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunawoke.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d65a22406---jiwikonawupajijolitexi.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/18489062308.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/68089465335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+sleep+monitoring+app+for+androidPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 16320 bytes
SHA-256: 2bcfbde63b6d95ebf2c3efa545e663cf405ac5c5bbc9d6d39192344f17a681bb
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 10892 bytes
SHA-256: 71e70951a6afa0e103e34519d4eb54055d1b062a06762ff76f10054be28a6dc5
font_03_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 17668 bytes
SHA-256: 2d13d13fe8ca7a156a76a5bc754627cf6948c252056872956cd62546623c504d

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