Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd36730c590ca9a5…

MALICIOUS

PDF

90.4 KB Created: 2021-09-17 08:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cf695a1d2a0e2ab29196cbb1182e603 SHA-1: 9648e2402f8266317b34512ec02ae8164335a0c5 SHA-256: cd36730c590ca9a5db3bc721519963157e872c68d4ea68a089b5fd48f3c58293
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates potential execution of commands, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coral-travel66.ru/admin/ckfinder/userfiles/files/92195285874.pdf In PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96d0a5b95---39069433807.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/94058277750.pdfIn PDF document text
    • http://mamitobe.ru/files/file/pasuxeve.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94bce0931---89375796207.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/viloxexotesa.pdfIn PDF document text
    • https://congchung7.com/upload/file/28011585287.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/81846988013.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/pabave.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bagonu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b8a1f85ca3f6ca32ed928d2c14ae3434/66897258358.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/rapakigadusemesikiru.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/zelulivulevalonu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5834adf0---jufexazesopovodasosi.pdfIn PDF document text
    • http://budropol.de/Upload/file/72157842825.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/4175839837.pdfIn PDF document text
    • http://hodori247.com/uploads/files/terurefovadiboxun.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/20120333899.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/26855812091.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/wideselekosawoteripu.pdfIn PDF document text
    • http://qdcmd.com/data/files/55254034796.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/wemejavapepo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/tonidimavinoxedi.pdfIn PDF document text
    • http://kawana.tech/userfiIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+install+mx+player+on+firestickPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 11028 bytes
SHA-256: fde2c4ff121de9fc75591c521be3fa3e7fe3f7041bc25e1e248777f899052dc3
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 21488 bytes
SHA-256: f051074326fce6837a1c705963812f4b917e675eca7428db11307a62be09572b
font_03_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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