Malicious PDF — malware analysis report

Static analysis result for SHA-256 8824e31c85332bc3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 16:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 71bad2bb71c2b9d2129403f51a227189 SHA-1: 999ce254e3d839e4afa944406576e7e2c68e3c58 SHA-256: 8824e31c85332bc37da4c07c0ad6f3adf93d9c6d659eddc44c6ff8c26ef9f359
244 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URLs, indicating it is designed to lure the user into downloading and executing a malicious payload. The heuristics suggest social engineering tactics, including a remote support tool lure and instructions to run commands, consistent with bypassing macro restrictions. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/uplcv?utm_term=hamachi+tunnel+problem+peer+connection PDF link annotation
    • https://pfhotel.gr/ckfinder/userfiles/files/davudodedowawadovivutiri.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/73514071325.pdfIn PDF document text
    • https://noventa.cz/media/files/file/paxafibadunugazuvutowagav.pdfIn PDF document text
    • https://clubon.top/uploads/files/64917958533.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/85017342133.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/31611028148.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/6667993612.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109130607252468.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/7864923333.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/dakilox.pdfIn PDF document text
    • https://superpart.com/files/70270903111.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61a83fd9d---sukuraji.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377beb1a6b9---89469695884.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6547052426.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415e4d06726---46231940456.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/lumaxoxarigosek.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/gilufatopojexizutodefil.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161442197618ef---95004342007.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/10063082498.pdfIn PDF document text
    • https://grnca.org/img/files/files/45615414645.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/melurivemuso.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/486211872.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19748436502.pdfIn PDF document text
    • http://travellerisland.com/files/44583735397.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ffd2e17---42532959693.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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 10700 bytes
SHA-256: 29069608bc0cceea2c2011107256157baf0418be421ddee89b06466b1fb07335
font_01_sfnt_off0000f228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF228 18264 bytes
SHA-256: 145fae4c5e86007c0465ae23e3ea3fa290b1afaab83046d686bd7ac38a2c77d1
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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