Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efad4cc34fba241…

MALICIOUS

PDF

363.0 KB Created: 2021-07-31 06:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb35d2e3f910fef60e954f55e1570b35 SHA-1: 62090478e3544d912e0e45c8dbad235b1749813f SHA-256: 9efad4cc34fba2419e0d25c0b5d052304d9a5db4b23d1a29e9f033a164049f42
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, with one heuristic specifically identifying a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation or phishing. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8q38h7254g83mv4d5loponhalo/ruzededogipisunijori.pdf In PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/tusotemib.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wepawipozuremoxeridaxip.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ks84454rhqmun8msse8mrudis5/73302750303.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e606282dd62---wuvojowuzo.pdfIn PDF document text
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/6814248819.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/tifurifunekadi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b71264417---68378739496.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a210d894add---12277274714.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/1611786954.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e4fc0a46---94395502662.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/gezikejabitokonitukegizin.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088056143181---lovekar.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afcf33fc7---difezukor.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/66175471373.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/36916371317.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dupegituxewuwabo.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/sepabinufugewaselifipili.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/bominipuku.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/tuputubak.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/ad5b86026b66beb11a017a2684808792/70845311137.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/oipsnfpnli6ajtk8qmvfgfu6fh/kisewabuditelidi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/61851021927.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/75794233110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=microsoft+word+2010+test+%C3%A7al%C4%B1%C5%9Fma+sorular%C4%B1+198+soruPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00053716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53716 11868 bytes
SHA-256: 609b1e4ba428e058d1a0d92507a3bda58a429736eee17959ce286a1f54d4e152
font_01_sfnt_off000552ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00056ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56AE0 19084 bytes
SHA-256: 786eb04de18b2138f2e32fa1ae8662a1345a02bcc95877cab3cf6d6ede1b29f4

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