Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d45e959433ccfb…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 02:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3aecc0e2c2b5cc55241450e2b5bf021 SHA-1: 13e7b7e496d1fcd171a57ef1676f7afbd1f8b590 SHA-256: 91d45e959433ccfbb9f57e8cf6c367be3d6b57e3aaf0e445f2a29566629c9215
216 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to execute commands, a common tactic for downloading and running further malicious code. The presence of multiple links to compromised WordPress sites and IP addresses further supports this, indicating a distribution mechanism for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • 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 http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/59868648756.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc8540eee---90046052702.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6aa009205---nosobodeduminafutuzam.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/zukoka.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/dabategelabupulifep.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/baniberatavolovajufug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349c62da1ee---zuzisunikoxefojolabazod.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/puwakizadigubimopo.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/fexejezapuladadaxam.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/k7ga8ufspof46pm0itcamikg20/5099694933.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/sosikufunukomoxatebanutub.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/rejupibakugijubajeruvinil.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16135055de8a75---fegotamodalerebaruwaleza.pdfPDF link annotation
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/32836694949.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/nominoderawumulefexaf.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/17952207042.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/zatawitosimewik.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/kesadurabarixawebuger.pdfIn PDF document text
    • https://mollis.rs/files/kapisozip.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/52458003705.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/1951262439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=snapseed+for+pc+windows+10PDF link annotation
    • 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10804 bytes
SHA-256: 4b2a4e318d3b199d353a58f500419cf2e00c5bb092f9285e0dd6c5dfd6b4224a
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 17836 bytes
SHA-256: 2a17022cc04485ad9db76215b9a9b85b6fdf4f789fa4de8ffa4759e4097f812a
font_02_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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