Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e74e2b1440aff9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 03:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e75ec324af41fab26485e3530b31537 SHA-1: 25371898ec4dff98d3d7ea1d1358475cfa6af548 SHA-256: c6e74e2b1440aff9fc5296860fbabf35b376a655ce4d4428e187218e7dc95e67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://synerhu.ru/uplcv?utm_term=last+day+on+earth+survival+mega+mod PDF link annotation
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/sazazesed.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/ripuvokala.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/xilovetodosinunitopovo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/faxizonex.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/52933691035.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/76194945111.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/41237585547.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/45191976607.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161396d9bd2ead---wujax.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/teril.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lewokuzalufowaximituro.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/duvakiwavirilat.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/zibanolidi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2a2fba218---32570740292.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/73922618371.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/megasodezilik.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/rasovorafumenolezikaneb.pdfIn PDF document text
    • https://zzhqhi.com/d/files/85048320823.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/notutajiworagok.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4f1cfe92ab7a6e255a3154e759c5bf7f/70252787133.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/52573503528.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/riviwu.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/3856065239.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sogotepagitofigilugo.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/73288494622.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/33770286306.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/nezadawunijakoto.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_off0000c3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10932 bytes
SHA-256: 25c0902004ee82765d7ef7ffb0b0eb896fb834baff9867a873957173dc238847
font_02_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 18816 bytes
SHA-256: 8d3569c4fec9d513c05e6e7797e47ca485836c4dce7e7cc7d21442c54145de0d

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