Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e8ed497ffa1bcd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 03:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cafc3498239b07b1a821fc6ae83373c5 SHA-1: 02bb081b081e76d30b7e6390e09ee02a3093794d SHA-256: b7e8ed497ffa1bcdae95e00cdd84a919721af37b5ef2a0a5a35c0a595ce50c5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=s10+vs+xs PDF link annotation
    • http://goldmustang.ru/files/files/jikaburilupo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161397147e39d7---dagodixukufikoto.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/nelirewenawikupamakarutaf.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomifupujemesukepitisa.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/kepavu.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/tadivewilegutapiviku.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/rokinum.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/25b3539d882a29dbba7e2eb9164dbbb2/nomutawiduwiva.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/juwepimusovitagozomupaw.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/1320394552.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-05/images/files/tirini.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/66913175fc6e9881b09029f460aaefed/retoxasomuvovuzodevasewu.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/46317087326.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/31811105557.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/25320255765.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mikumurob.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/remuzamodamafusoweben.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7nhrldajlbutb67betf18bek2v/37580873838.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/fovadamekusufodemezivobu.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lakam.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b44ed0f008---57166325653.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37049258698.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/13120894323.pdfIn PDF document text
    • http://exima.kr/userData/board/file/1872082255.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/xaxajukofizajawifagiv.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 18860 bytes
SHA-256: 80c1238326597c3f68f30cc2c928f6285b81be3d1397fc7e8a42584de812588f
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA8 9664 bytes
SHA-256: 4fac8d6cd1fc8914a2d6222acb0afaa5dd24944deca262c611f94da4e1f47c8f

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