Malicious PDF — malware analysis report

Static analysis result for SHA-256 278609e6de0b8905…

MALICIOUS

PDF

95.4 KB Created: 2021-08-06 22:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d5719d5879c54258d2914fecf1b82dc SHA-1: 71de90d2cf1df8f40ba1f97fa8e4160ae265b962 SHA-256: 278609e6de0b8905064bec3a119e0db77c41c76c385ece6aac3e94f010e41661
256 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The document also includes lures for clipboard command execution and remote support tools, indicating an attempt to trick the user into compromising their system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://synerhu.ru/uplcv?utm_term=can+android+studio+run+on+linux PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6d451891---daxadejipas.pdfPDF link annotation
    • https://nestaerospace.com/uploads/file/zufubudamapujaj.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/16752977468.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/rerupegofulobufap.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/97e3b63ed31abbe71b69d87c2b085134/94349630631.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/49466659521.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/magema.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/pexatuzijitatif.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e21add668---figeniseb.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160965211f2f3c---71116618365.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/6kg265gop5jov782q6mss18ig5/rezun.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/46604804587.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e723bffb3---vetotafovinig.pdfIn PDF document text
    • http://christopherdallo.com/file/fewunebijozesuderuloju.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7434d47ae3a9892617c0b9b886b9504a/9335359558.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/71000216130.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/rogawif.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/sifodupagigedubelotawoner.pdfIn PDF document text
    • http://risme.vn/files/zuwajada.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081a25565fdf---penixomeduxurexoson.pdfIn PDF document text
    • http://expresskaliski.info/file/68470643974.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/21842433050.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_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 18348 bytes
SHA-256: 46c8a8897e84632da7d9a63f63b3d66da7b9581e68b9002cfbda00b97ab577bb
font_01_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001593d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593D 10344 bytes
SHA-256: e56ba61a8e438429c954ed454ca9115eea2facdf2ad41dad5c78963586d737a6

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