Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f910724058f1e94…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 17:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a1fca8071fba37368b8954a8f6a69a7d SHA-1: 18db7afae5605f72f663d6cda3af4fa3f6e34ce7 SHA-256: 3f910724058f1e94462af06d5b5a694ae3582fef1138102c5771201d3df416a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm with numerous external URIs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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=free+nudifier+app+for+android PDF link annotation
    • http://hiace-yoshikawa.com/js/upload/files/luduxoduf.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/xerabiworulukutox.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/11824644689.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/keriwofapiwerikageso.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9de15127---21868690556.pdfIn PDF document text
    • http://montereypark.kopanramen.com/uploads/files/zedipemajipesaziv.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd54ec91d048817674da3a6607b552c6/rudaf.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/xelujorulomalora.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/buxuligoferemupagerixevu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f423071c61---lobofosanezimil.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rezodifugapifetebamesebuf.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/98875493691.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tq0l8dtdq0kqifdq1f9vvhb619/vuzegemazosus.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/32370417661397ad7cf264.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/zafixixubujekumok.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/60550664055.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/getexamopu.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/jebizetelawimoses.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/35d56234378d7a04a930557fe6220fe5/tuzosipawalirupexexa.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/4714959135.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/vubasobupobera.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/jozoxakiwa.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xogozaminoz.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120902196240.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/74519166369.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_off0000b0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CF 10256 bytes
SHA-256: b6acc2b62e73793fdee9dee9b324220999b990be6724524207ec329942de52b4
font_01_sfnt_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 15236 bytes
SHA-256: 6a8fab431c8f4d68a0b010a7e815d68f00c5f14a39e98eb855f764d87af6f333
font_02_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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