Malicious PDF — malware analysis report

Static analysis result for SHA-256 283c39f12c6d3080…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 16:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1436869e9dc791ac593d4bc50524ed8f SHA-1: 2ab4752bd5f3c08134f181793642982f266f8aa9 SHA-256: 283c39f12c6d30809803b4326eb915497a92ae35ae5c40f6b4fc16fd12a96e0e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect with a remote support tool, a common pretext for gaining unauthorized access. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • 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 http://dream-mebel.com/pic/file/36101882509.pdf
    • http://baugeraeteverleih.de/benutzerdateien/zulidemunu.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e07fb37fe---woselojafirazidevegodo.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/3902151147.pdf
    • http://01host.ru/userfiles/files/76877855450.pdf
    • http://visit-pune.com/userfiles/file/vovikerozazajigufu.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/67451106048.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/92123452666.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/4931421473.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be781eda56---mizadizekejitufavimofak.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/fokixifijo.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7ddbace07---xiranujexevelo.pdf
    • https://plagij.at/ckfinder/userfiles/files/84853394743.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/fibuvizole.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/522a25f872cdcc10191c972e9cb90fb4/90300616333.pdf
    • https://subded.org/userfiles/file/kebusewijebidusowamataf.pdf
    • http://tz5168.com/uploadfile/image/2021/09/22/file/20210922_000605_179.pdf
    • http://sztarmedia.hu/_user/file/87703871528.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a92c1d085---duremisazavodina.pdf
    • http://www.atsamuihaus.com/image/upload/File/rigezovu.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63436229---wuvetuwupepisamiziti.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210905_747B3F0574D44A05.pdf
    • https://faktxeber.ru/resimler/files/jabeluwu.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210915_D790813C0F75D764.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+remote+control+android+phone+from+pc+using+teamviewer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e6.bin
af3787fadb28cd948d9e668f12e8120f9b6f8382bf7c15e5fdd755941df83ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 17740 bytes
font_01_sfnt_off00010775.bin
13617ed92d041a374ea3f5d13103b30679a6f9c5453bd8c9584258940cec37fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 11312 bytes
font_02_sfnt_off000121ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes